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In a meter bridge, the wire of length 1 m has a non-uniform cross-section such that, the variation A d dR of its resistance R with length A is A d dR ∝ A 1 . Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP ? R' G P R' A 1– A A B

1. 0.3 m
2. 0.25 m
3. 0.35 m
4. 0.2 m

Correct answer: 0.25 m

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