Question

Assertion : Eddy currents generate resistive losses that transform some forms of energy, such as kinetic energy, into heat.

Reason : Amount of energy lost by eddy current $=$ change in kinetic energy of the conductor

Choose the correct alternative corresponding to the given assertion and reason.

• A. Both assertion and reason are correct, and reason is the correct explanation of the assertion
• B. Both assertion and reason are correct, and reason is not the correct explanation of the assertion
• C. Assertion is correct, but reason is incorrect
• D. Assertion is incorrect, but reason is correct

Answer 1

The correct option is B Both assertion and reason are correct, and reason is not the correct explanation of the assertion

An eddy current is a swirling current set up in a conductor in response to a changing magnetic field.

By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change.

Because of the tendency of eddy currents to oppose, eddy currents cause energy to be lost.

More accurately, eddy currents transform useful forms of energy, such as kinetic energy, into heat, which is generally much less useful.

Also, the amount of energy lost by eddy current is equal to the change in kinetic energy of the conductor.

Hence, assertion and reason are correct and reason is not the correct explanation of assertion.