Assertion :When a periodic disturbing force keeps the body in vibration through out its entire period of motion, such vibration is said to be a forced vibration. Reason: The frequency of vibration of the body is same as the frequency of the applied force.

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
Here both assertion and reason are correct but the reason is not the correct explanation for an assertion. As the frequency of the body is not always some to the frequency of the body is not always some to the frequency of applied force. When the frequency of body become equal with the frequency of depriving force, resonance is produced.

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