Assertion :The emf of the driver cell in the potentiometer experiment should be greater than the emf of the cell to be determined. Reason: The fall of potential across the potentiometer wire should not be less than the emf of the cell to be determined.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
If either the emf of the driver cell or the potential difference across the whole potentiometer wire is lesser than the emf of the experimental cell, the balance point will not be obtained. The balance point indicates that emf of the cell to be determined is just balanced by the voltage drop appears across the wire.

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