A thin diamagnetic rod is placed vertically between the poles of an electromagnet. On switching on the current, the rod is pushed up and out of the horizontal magnetic field. The required energy comes from which source?
Options

Question

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. On switching on the current, the rod is pushed up and out of the horizontal magnetic field. The required energy comes from which source?

Options

G1 Physics · Accepted Answer

Step 1: Diamagnets develop induced magnetisation opposite to the applied field and tend to leave strong-field regions. Step 2: Switching on an electromagnet establishes the field and repels the rod upward. Step 3: The lifting energy (gravitational potential) comes from the electrical energy supplied by the current source. Final: option C. Final answer: (C) the current source.