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MHT CET 2023 (9 May, Shift 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from MHT CET 2023 (9 May, Shift 1)

Q44MHT CET 2023 · 9 MAY · SHIFT 1Medium

Wheatstone Bridge & Metre Bridge

In a meter bridge experiment null point is obtained at $l\text{ cm}$ from the left end. If the meter bridge wire is replaced by a wire of same material but twice the area of across-section, then the null point is obtained at a distance

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Answer: (b)

Balance uses the ratio $\dfrac{l}{100 - l}$ of resistances of two parts of a uniform wire.
Changing the cross-section changes both parts by the same factor, so the ratio and the null point stay the same.
So the answer is (b) $l\text{ cm}$ from left end.

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