Question

explain with the help of a suitable example , how we can show that lenz law is a consequence of the principle of conservation of energy

Answer 1

How is Lenz's Law related to the conservation of energy?

Lenz's Law states that, when you induce a current in a wire via a changing magnetic field, the current flows through the wire in such a direction so that its magnetic field opposes the change that produced the current.

So, what happens when you induce a current by, say, moving a wire through a magnetic field, is that you're converting mechanical energy (the energy of the wire's motion) into electrical energy (the energy carried by the induced current).

Lenz's Law ensures that the mechanical energy of the wire is reduced by the same amount of energy gained by the current. It does this by exerting a force on the wire opposing the wire's motion. This causes the wire to lose mechanical energy (its motion is impeded); it must do work against the induced magnetic field to generate current.

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