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: (a) A only (b) B and D only (c) A and C only (d) C only

Answer: (c). Sensitivity is the ability to show a small p.d. as a large length: higher for smaller k. So sensitivity ∝ 1/k (C true, B false). k = V/L, so sensitivity ∝ L (A true, D false). So the answer is (c) A and C only.

With the help of potentiometer, we can determine the value of emf of… | JEE Main 2023 (29 Jan, Shift 2)

Q39JEE Main 2023 · 29 JAN · SHIFT 2Easy

Potentiometer

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

(D) inversely proportional to the length of the potentiometer wire

Choose the correct option for the above statements:

Show answer and solution

Answer: (c)

Sensitivity is the ability to show a small p.d. as a large length: higher for smaller $k$ .
So sensitivity $\propto \frac{1}{k}$ (C true, B false).
$k = \frac{V}{L}$ , so sensitivity $\propto L$ (A true, D false).
So the answer is (c) A and C only.

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Potentiometer question from JEE Main 2023 (29 Jan, Shift 2)

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