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Passing current through a magnet

Passing current through a magnet - Physics Forum

Passing current through a magnet - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 05-23-2011, 10:02 AM
Pipette Filler
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Default Passing current through a magnet



I think magnet has to be a conductor of electricity if is made of iron or steel. So, What happens when we pass a direct current through a magnet? What if we pass through AC? Does the passage of current effect the strength of the magnet?
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Old 07-03-2011, 08:17 PM
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Default Re: Passing current through a magnet

For a magnetic field induced by current to be the same value as own field of magnet the current should be about 10^4 A, so for an ordinary wire it will result in temperature increasing and at first achieving the Curie point(loss of own magnetism) and then - melting.
so if you use not high values of current, then one may ignore the field induced by it, and strength will not change.
but with special geometry of a conductor and great heat removal nothing is impossible)
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Old 12-08-2011, 10:20 AM
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Default Re: Passing current through a magnet

You know there will be two effects, one is a possible change in the permanent magnetic flux intensity of the magnet and another one is that generation of a secondary magnetic flux intensity which will be detectable as a spiral field around the metal object.

(i.e.,) If we pass a current through a magnet, it may play with the exchange interaction, disaligning the individual domains, reducing the overall magnetic flux intensity of the magnet. The current will develop an additional magnetic field which will spiral around the (assumed) length wise orientation of the bar magnet. This will create a superposition of the magnetic flux intensities, and likely work to disrupt the orientations of the magnetic domains within the magnet.
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Old 01-03-2012, 11:26 AM
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Default Re: Passing current through a magnet

など明るい色のコントラス
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Old 03-24-2012, 07:25 AM
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Default Re: Passing current through a magnet

Many permanent magnets are based on iron compounds, so are conductive.Magnet is a good conductor of electricity so current easily pass through this from one point to another.
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Old 03-28-2012, 05:30 AM
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Default Re: Passing current through a magnet

how magnet can be conductor i mean they are made up of conductors itself from iron and steel.in magnet dipoles are arranged linearly and to break that dipole lot of energy is required after that there is chance of magnet to be conductor .
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Old 03-28-2012, 05:31 AM
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Default Re: Passing current through a magnet

how magnet can be conductor i mean they are made up of conductors itself from iron and steel.in magnet dipoles are arranged linearly and to break that dipole lot of energy is required after that there is chance of magnet to be conductor .
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