Question

In a meter bridge, the wire of length 1 m has a non-uniform cross-section such that, the variation (dR/dl) of its resistance R with length l is (dR/dl) ∝ 1/√l
. 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?
(A) 0.2 m (B) 0.3 m
(C) 0.25 m (D) 0.35 m

Answer 1

i think so ans is a 0.2 m .

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