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JEE Main 2022 · 27 Jul · Shift 2, Physics question 52

In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is 40 cm. The balancing length, if the radius of the wire AB is doubled, will be ______ cm.

Metre bridge: R1 and R2 in the upper gaps fed by a 5 V cell; galvanometer G from their junction to the jockey C on wire AB.
Answer and worked solution

Official answer: 40

Balance depends only on R1R2=l100−l\frac{R_1}{R_2}=\frac{l}{100-l}; the wire is uniform whatever its radius. Still 40 cm.

Answer: 40

Topics:Wheatstone bridge and metre bridge
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