Q117 / 180 · NEET 2018 · Physics

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

  • A
    The lattice structure of the material of the rod
  • B
    The magnetic field
  • Correct answer
    C
    The current source
  • D
    The induced electric field due to the changing magnetic field

Solution

The work required to lift must be coming from the current source which is causing the current to blow through electromagnet.

Hence, the correct answer is option: 'C'.

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