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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
Explanation
The energy is ultimately supplied by the source driving the electromagnet.
Detailed Solution
Energy of the current source will be converted into the potential energy of the rod.
So the work comes from the current source.