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Question
Assertion (A): A single coil of many turns produces fluctuating e.m.f. in a.c. generator.
Reason (R): The coil in the a.c. generator is moving at a slow speed.
Options
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
Assertion (A) is false, but Reason (R) is true.
Assertion (A) is true, but Reason (R) is false.
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Solution
Assertion (A) is true, but Reason (R) is false.
Explanation:
The assertion is true because when a coil rotates in a magnetic field in an a.c. generator, the magnetic flux linked with it keeps changing, so the induced e.m.f. rises and falls, that is, it fluctuates. The reason is false because the fluctuating nature is due to the continuous change in flux linkage, not because the coil moves slowly. Hence assertion is true but reason is false.
