A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

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The current source

The magnetic field

The lattice structure of the material of the rod

The induced electric field due to the changing magnetic field

answer is A.

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Detailed Solution

Energy of current source will be converted into gravitational potential energy of the rod.

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