Assertion :Average value of ac over a complete cycle is always zero. Reason: Average value of ac is always defined over half cycle.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The mean average value of alternating current (or emf) during a half, cycle is given by $I_{m} = 0.636 I_{0}$ ( or $E_{m} = 0.636 E_{0}$ )
During the next half cycle, the mean value of ac will be equal in magnitude but opposite in direction.
For this reason the average value of ac over a complete cycle is always zero. So the average value is always defined over a half cycle of ac.

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