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With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is (A) Directly proportional to the length of the potentiometer wire (B) Directly proportional to the potential gradient of the wire (C) inversely proportional to the potential gradient of the wire (D) inversely proportional to the length of the potentiometer wire Choose the correct option for the above statements: (1) C only (2) B and D only (3) A and C only (4) A only

1. C only
2. B and D only
3. A and C only
4. A only

Correct answer: C only

Solution

The sensitivity of a potentiometer is influenced by the length of the wire and the potential gradient; a longer wire increases sensitivity, while a higher potential gradient decreases it. Thus, the correct option reflects that sensitivity is directly proportional to the length of the wire (A) and inversely proportional to the potential gradient (C).

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