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MHT CET 2026 (11 Apr, Shift 2) · Potentiometer

Potentiometer question from MHT CET 2026 (11 Apr, Shift 2)

Q21MHT CET 2026 · 11 APR · SHIFT 2Medium

Potentiometer

In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire 'x' cm long. If length of potentiometer wire is increased by few cm without changing the cell, the balancing length will (Driving source is not changed)

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Answer: (b)

Same driver, so the same p.d. is spread over a longer wire: $k = \dfrac{V}{L}$ decreases.
Balancing length $l = \dfrac{E}{k}$ increases.
So the answer is (b) increase.

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