If the length of the potentiometer wire is increased by keeping constant potential difference across the wire, then (a) the null point is obtained at shorter distance. (b) the potential gradient is increased. (c) the null point is obtained at larger distance. (d) there is no change in the null point.

Answer: (c). k = V/L; with V fixed, a longer wire gives smaller k. l = E/k, so the balancing length increases. So the answer is (c) the null point is obtained at larger distance.

If the length of the potentiometer wire is increased by keeping… | MHT CET 2025 (20 Apr, Shift 2)

Q24MHT CET 2025 · 20 APR · SHIFT 2Easy

Potentiometer

If the length of the potentiometer wire is increased by keeping constant potential difference across the wire, then

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Answer: (c)

$k = \frac{V}{L}$ ; with $V$ fixed, a longer wire gives smaller $k$ .
$l = \frac{E}{k}$ , so the balancing length increases.
So the answer is (c) the null point is obtained at larger distance.

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