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Assertion The wire of a potentiometer should be of uniform area of cross section. Reason It satisfies the requirement of the principle of the potentiometer.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Correct answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Solution

A potentiometer wire must have uniform cross-sectional area so its resistance per unit length is constant, giving a uniform potential gradient. This is exactly what the potentiometer principle requires for accurate comparison of emf.

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