Question

Which of the following statement is valid?

(a) Lenz’s law is a consequence of the law of conservation of energy

(b) Lenz’s law is a consequence of the law of conservation of momentum

(c) Lenz’s law is a consequence of the law of conservation of force

(d) Lenz’s law is a consequence of the law of conservation of mass

This question was addressed to me during an online interview.

I would like to ask this question from Electromagnetic Induction in section Electromagnetic Induction of Physics – Class 12

Answer 1

The correct choice is (a) Lenz’s law is a consequence of the law of conservation of energy

To elaborate: Whether a magnet is moved towards or away from a closed coil, the induced current always opposes the motion of the magnet, as predicted by Lenz’s law. Work has to be done in moving the magnet closer to the coil against this force of repulsion. Thus Lenz’s law is valid and is a consequence of the law of conservation of energy.