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JEE Main 2026 (21 Jan, Shift 2) · Potentiometer

Potentiometer question from JEE Main 2026 (21 Jan, Shift 2)

Q11JEE Main 2026 · 21 JAN · SHIFT 2Medium

Potentiometer

The total length of potentiometer wire AB is 50 cm in the arrangement as shown in the figure. If P is the point where the galvanometer shows zero reading then the length AP is ________ cm.

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Answer: (b)

Zero galvanometer reading means a balanced Wheatstone bridge: $\frac{6}{4} = \frac{AP}{PB}$ .
$AP = 50 \times \frac{6}{10} = 30\ \text{cm}$ .
So the answer is (b) 30.

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