Permanent Magnetic Field vs Electromagnetic Field
If I put a permanent magnet under a box and an energized electromagnetic coil under another box could you tell me which box was covering the permanent magnet? If the answer is yes what test would you use?
Note: The coil is receiving a steady dc current.
electromagnetism magnetic-fields
asked Jan 8 at 18:06
LambdaLambda
2,51641126
add a comment |
If I put a permanent magnet under a box and an energized electromagnetic coil under another box could you tell me which box was covering the permanent magnet? If the answer is yes what test would you use?
Note: The coil is receiving a steady dc current.
electromagnetism magnetic-fields
asked Jan 8 at 18:06
LambdaLambda
2,51641126
Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago
add a comment |
If I put a permanent magnet under a box and an energized electromagnetic coil under another box could you tell me which box was covering the permanent magnet? If the answer is yes what test would you use?
Note: The coil is receiving a steady dc current.
electromagnetism magnetic-fields
asked Jan 8 at 18:06
LambdaLambda
2,51641126
If I put a permanent magnet under a box and an energized electromagnetic coil under another box could you tell me which box was covering the permanent magnet? If the answer is yes what test would you use?
Note: The coil is receiving a steady dc current.
electromagnetism magnetic-fields
electromagnetism magnetic-fields
asked Jan 8 at 18:06
LambdaLambda
2,51641126
asked Jan 8 at 18:06
LambdaLambda
2,51641126
asked Jan 8 at 18:06
LambdaLambda
2,51641126
asked Jan 8 at 18:06
LambdaLambda
2,51641126
asked Jan 8 at 18:06
LambdaLambda
2,51641126
2,51641126
Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago
add a comment |
Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago
Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago
add a comment |
6 Answers
6
active
oldest
votes
The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
add a comment |
If this is a normal coil wound with resistance wire, then around the coil with current will be the electric field and magnetic field, and around the permanent magnet only magnetic field. If the boxes do not shield the electric field, it will not be difficult to detect the coil with current by measuring the electric field.
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
add a comment |
Warm it up near or beyond the Curie temperature, it will make no difference to the coil but the "permanent" becomes "impermanent".
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
add a comment |
If the permanent magnet and the electromagnet are shaped so that the field in the box has precisely the same shape, there is no way to know which box covers which magnet, simply by measuring the field using a tiny probe magnet or tiny probe coil with very small current.
However, it may be possible to distinguish between the two cases by a more "intrusive" measurement: A metal detector, for example, would very likely respond slightly differently for one than the other. The electromagnet coil would act as a transformer secondary if driven by an electromagnet above the box, and should behave in a slightly different way than the permanent magnet.
Edited for clarity: "Driven" means, in this context, that the electromagnet above the box is energized by a time-varying current, which will produce a time-varying field, which in turn will "drive" a time-varying additional EMF in the coil below the box.
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
add a comment |
With an x-ray snapshot you should be able to see the difference :). However the magnetic fields can be made to be indistinguishable within certain intensity limits. There is a limit to what a permanent magnet can achieve in a certain volume. An electromagnet can produce a much stronger field.
See https://hypertextbook.com/facts/2000/AnnaWoo.shtml .
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
add a comment |
Electromagnets can produce a stronger pulsed field, but not a steady-state field as the windings would burn up fast. Oddly enough the same intense magnetic pulse is used to magnetize neodymium-iron-born (NIB) magnets.
For a steady-state magnetic field (not superconducting) NIB alloys have the strongest field for now. Some NIB alloys will tolerate intense heat at the cost of total field strength.
edited 2 days ago
Peter Mortensen
1,93011323
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
add a comment |
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6 Answers
6
active
oldest
votes
6 Answers
6
active
oldest
votes
active
oldest
votes
active
oldest
votes
The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
add a comment |
The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
add a comment |
The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
answered Jan 8 at 20:25
Run like hellRun like hell
1,318725
1,318725
add a comment |
add a comment |
If this is a normal coil wound with resistance wire, then around the coil with current will be the electric field and magnetic field, and around the permanent magnet only magnetic field. If the boxes do not shield the electric field, it will not be difficult to detect the coil with current by measuring the electric field.
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
add a comment |
If this is a normal coil wound with resistance wire, then around the coil with current will be the electric field and magnetic field, and around the permanent magnet only magnetic field. If the boxes do not shield the electric field, it will not be difficult to detect the coil with current by measuring the electric field.
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
add a comment |
If this is a normal coil wound with resistance wire, then around the coil with current will be the electric field and magnetic field, and around the permanent magnet only magnetic field. If the boxes do not shield the electric field, it will not be difficult to detect the coil with current by measuring the electric field.
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
If this is a normal coil wound with resistance wire, then around the coil with current will be the electric field and magnetic field, and around the permanent magnet only magnetic field. If the boxes do not shield the electric field, it will not be difficult to detect the coil with current by measuring the electric field.
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
answered Jan 8 at 20:13
Alex TrounevAlex Trounev
31215
31215
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
add a comment |
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
there are "non contact voltage testers" on the market.amazon.com/Voltage-Detector-Non-Contact-Electric-12~220V/dp/… . Here is a report on DC testers e-reports-ext.llnl.gov/pdf/374701.pdf
– anna v
Jan 8 at 20:34
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thank you, I have it.
– Alex Trounev
Jan 8 at 20:36
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@annav Thanks for posting the links. I am wondering if the probes wouldn’t also measure the magnetic field.
– Lambda
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
@Lambda if you look at the designs ,no. they are designed for electrif fields
– anna v
2 days ago
add a comment |
Warm it up near or beyond the Curie temperature, it will make no difference to the coil but the "permanent" becomes "impermanent".
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
add a comment |
Warm it up near or beyond the Curie temperature, it will make no difference to the coil but the "permanent" becomes "impermanent".
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
add a comment |
Warm it up near or beyond the Curie temperature, it will make no difference to the coil but the "permanent" becomes "impermanent".
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
Warm it up near or beyond the Curie temperature, it will make no difference to the coil but the "permanent" becomes "impermanent".
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
answered Jan 8 at 19:52
hyportnexhyportnex
4,3271824
4,3271824
add a comment |
add a comment |
If the permanent magnet and the electromagnet are shaped so that the field in the box has precisely the same shape, there is no way to know which box covers which magnet, simply by measuring the field using a tiny probe magnet or tiny probe coil with very small current.
However, it may be possible to distinguish between the two cases by a more "intrusive" measurement: A metal detector, for example, would very likely respond slightly differently for one than the other. The electromagnet coil would act as a transformer secondary if driven by an electromagnet above the box, and should behave in a slightly different way than the permanent magnet.
Edited for clarity: "Driven" means, in this context, that the electromagnet above the box is energized by a time-varying current, which will produce a time-varying field, which in turn will "drive" a time-varying additional EMF in the coil below the box.
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
add a comment |
If the permanent magnet and the electromagnet are shaped so that the field in the box has precisely the same shape, there is no way to know which box covers which magnet, simply by measuring the field using a tiny probe magnet or tiny probe coil with very small current.
However, it may be possible to distinguish between the two cases by a more "intrusive" measurement: A metal detector, for example, would very likely respond slightly differently for one than the other. The electromagnet coil would act as a transformer secondary if driven by an electromagnet above the box, and should behave in a slightly different way than the permanent magnet.
Edited for clarity: "Driven" means, in this context, that the electromagnet above the box is energized by a time-varying current, which will produce a time-varying field, which in turn will "drive" a time-varying additional EMF in the coil below the box.
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
add a comment |
If the permanent magnet and the electromagnet are shaped so that the field in the box has precisely the same shape, there is no way to know which box covers which magnet, simply by measuring the field using a tiny probe magnet or tiny probe coil with very small current.
However, it may be possible to distinguish between the two cases by a more "intrusive" measurement: A metal detector, for example, would very likely respond slightly differently for one than the other. The electromagnet coil would act as a transformer secondary if driven by an electromagnet above the box, and should behave in a slightly different way than the permanent magnet.
Edited for clarity: "Driven" means, in this context, that the electromagnet above the box is energized by a time-varying current, which will produce a time-varying field, which in turn will "drive" a time-varying additional EMF in the coil below the box.
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
If the permanent magnet and the electromagnet are shaped so that the field in the box has precisely the same shape, there is no way to know which box covers which magnet, simply by measuring the field using a tiny probe magnet or tiny probe coil with very small current.
However, it may be possible to distinguish between the two cases by a more "intrusive" measurement: A metal detector, for example, would very likely respond slightly differently for one than the other. The electromagnet coil would act as a transformer secondary if driven by an electromagnet above the box, and should behave in a slightly different way than the permanent magnet.
Edited for clarity: "Driven" means, in this context, that the electromagnet above the box is energized by a time-varying current, which will produce a time-varying field, which in turn will "drive" a time-varying additional EMF in the coil below the box.
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
edited Jan 8 at 19:33
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
answered Jan 8 at 19:21
S. McGrewS. McGrew
7,34221131
7,34221131
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
add a comment |
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
1
1
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
Transformers do not work for DC.
– my2cts
Jan 8 at 19:28
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
I guess "driven" needs to be clarified.
– S. McGrew
Jan 8 at 19:31
add a comment |
With an x-ray snapshot you should be able to see the difference :). However the magnetic fields can be made to be indistinguishable within certain intensity limits. There is a limit to what a permanent magnet can achieve in a certain volume. An electromagnet can produce a much stronger field.
See https://hypertextbook.com/facts/2000/AnnaWoo.shtml .
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
add a comment |
With an x-ray snapshot you should be able to see the difference :). However the magnetic fields can be made to be indistinguishable within certain intensity limits. There is a limit to what a permanent magnet can achieve in a certain volume. An electromagnet can produce a much stronger field.
See https://hypertextbook.com/facts/2000/AnnaWoo.shtml .
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
add a comment |
With an x-ray snapshot you should be able to see the difference :). However the magnetic fields can be made to be indistinguishable within certain intensity limits. There is a limit to what a permanent magnet can achieve in a certain volume. An electromagnet can produce a much stronger field.
See https://hypertextbook.com/facts/2000/AnnaWoo.shtml .
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
With an x-ray snapshot you should be able to see the difference :). However the magnetic fields can be made to be indistinguishable within certain intensity limits. There is a limit to what a permanent magnet can achieve in a certain volume. An electromagnet can produce a much stronger field.
See https://hypertextbook.com/facts/2000/AnnaWoo.shtml .
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
edited Jan 8 at 19:37
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
answered Jan 8 at 19:30
my2ctsmy2cts
4,7422618
4,7422618
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
add a comment |
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
Are you saying that the information in th elink is wrong? It states that the strongest permanent field is 0.1 T, much less that that of a steady state electromagnet. Do you have a reference for your statement?
– my2cts
2 days ago
1
1
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 Btw: some electromagnets can exceed 10T. Obviously continuously, as they are superconducting. Here is a link: home.cern/news/news/engineering/…
– cmaster
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
@Sparky256 You claim my answer is wrong. Do you have a reference to show for it ?
– my2cts
2 days ago
add a comment |
Electromagnets can produce a stronger pulsed field, but not a steady-state field as the windings would burn up fast. Oddly enough the same intense magnetic pulse is used to magnetize neodymium-iron-born (NIB) magnets.
For a steady-state magnetic field (not superconducting) NIB alloys have the strongest field for now. Some NIB alloys will tolerate intense heat at the cost of total field strength.
edited 2 days ago
Peter Mortensen
1,93011323
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
add a comment |
Electromagnets can produce a stronger pulsed field, but not a steady-state field as the windings would burn up fast. Oddly enough the same intense magnetic pulse is used to magnetize neodymium-iron-born (NIB) magnets.
For a steady-state magnetic field (not superconducting) NIB alloys have the strongest field for now. Some NIB alloys will tolerate intense heat at the cost of total field strength.
edited 2 days ago
Peter Mortensen
1,93011323
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
add a comment |
Electromagnets can produce a stronger pulsed field, but not a steady-state field as the windings would burn up fast. Oddly enough the same intense magnetic pulse is used to magnetize neodymium-iron-born (NIB) magnets.
For a steady-state magnetic field (not superconducting) NIB alloys have the strongest field for now. Some NIB alloys will tolerate intense heat at the cost of total field strength.
edited 2 days ago
Peter Mortensen
1,93011323
Electromagnets can produce a stronger pulsed field, but not a steady-state field as the windings would burn up fast. Oddly enough the same intense magnetic pulse is used to magnetize neodymium-iron-born (NIB) magnets.
For a steady-state magnetic field (not superconducting) NIB alloys have the strongest field for now. Some NIB alloys will tolerate intense heat at the cost of total field strength.
edited 2 days ago
Peter Mortensen
1,93011323
edited 2 days ago
Peter Mortensen
1,93011323
edited 2 days ago
Peter Mortensen
1,93011323
edited 2 days ago
Peter Mortensen
1,93011323
1,93011323
answered 2 days ago
user219230
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
add a comment |
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
1
1
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
This heavily depends on the coil material, and, perchance, the cooling. Superconducting magnets don't have any issue delivering extremely strong magnetic fields continuously, and they obviously classify as electromagnets...
– cmaster
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
@cmaster. I am aware of superconducting magnets, which can also transfer DC power as a superconducting transformer. Superconducting was not part of the OP's question, so it is not part of any answers. It would have to be posted as a separate question.
– user219230
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
The record for the strongest steady state field is 45T ( en.wikipedia.org/wiki/Orders_of_magnitude_(magnetic_field) ). I don't believe that permanent magnets reach fields anywhere near this value. Please show me the paper.
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
@Sparky256 NIB magnets reach about 1T ( en.wikipedia.org/wiki/Neodymium_magnet#Magnetic_properties ).
– my2cts
2 days ago
add a comment |
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Is the supply current assumed to be essentially unlimited? Because if not, it will eventually deplete.
– Alex S
2 days ago
@AlexS Yes, a continuous supply.
– Lambda
2 days ago