Question

‘X’ set up in the drum exert a torque on the drum to stop the train. Identify X.

(a) Induction

(b) Eddy currents

(c) Electromagnetic oscillations

(d) Air pressure

This question was addressed to me at a job interview.

The question is from Electromagnetic Induction topic in section Electromagnetic Induction of Physics – Class 12

Answer 1

Correct answer is (b) Eddy currents

Best explanation: A strong magnetic field is applied to the rotating drum attached to the wheel. The eddy currents set up in the drum exert a torque on the drum to stop the train. That is the reason eddy currents are set up in the drum of the train wheel.