Why are diamagnetic substances repelled by magnets?
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Hey,
Diamagnetic substances create an induced magnetic field in a direction opposite to an externally applied magnetic field. They are repelled by the applied magnetic field. That’s the definition.
So perhaps the question should be why. In atoms the orbital motion of electrons creates tiny current loops, which produce magnetic fields. When an external magnetic field is applied to a material, these current loops will tend to align in such a way as to oppose the applied field. Sort of an atomic version of Lenz Law: induced magnetic fields tend to oppose the change which created them (Lenz Law of Electromagnetic Induction) .
Materials in which you see this magnetic reaction are diamagnetic. Interestingly enough everything is inherently diamagnetic, however, if the atoms have some net magnetic moment as in paramagnetic materials, or if there is and ordering of atomic magnetic moments like ferromagnetic materials, these guys always dominant. Diamagnetism is the remaining magnetic behavior when materials are neither paramagnetic nor ferromagnetic.
Now it is true that any conductor will show a strong diamagnetic effect in the presence of changing magnetic fields because circulating currents will be generated in the conductor to oppose the magnetic field changes. The YouTube below is a cool demonstration of this and it a great way to win a bets or two
Thanks!
@panditismm
Diamagnetic substances create an induced magnetic field in a direction opposite to an externally applied magnetic field. They are repelled by the applied magnetic field. That’s the definition.
So perhaps the question should be why. In atoms the orbital motion of electrons creates tiny current loops, which produce magnetic fields. When an external magnetic field is applied to a material, these current loops will tend to align in such a way as to oppose the applied field. Sort of an atomic version of Lenz Law: induced magnetic fields tend to oppose the change which created them (Lenz Law of Electromagnetic Induction) .
Materials in which you see this magnetic reaction are diamagnetic. Interestingly enough everything is inherently diamagnetic, however, if the atoms have some net magnetic moment as in paramagnetic materials, or if there is and ordering of atomic magnetic moments like ferromagnetic materials, these guys always dominant. Diamagnetism is the remaining magnetic behavior when materials are neither paramagnetic nor ferromagnetic.
Now it is true that any conductor will show a strong diamagnetic effect in the presence of changing magnetic fields because circulating currents will be generated in the conductor to oppose the magnetic field changes. The YouTube below is a cool demonstration of this and it a great way to win a bets or two
Thanks!
@panditismm
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Diamagnetic Levitation -Diamagnets repel, and are repelled by a strong magnetic field by a magnet . The electrons in a diamagnetic material rearrange their orbits slightly creating small persistent currents which oppose the external magnetic field. ... However, the addition of diamagnetic materials makes such levitation possible.
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