In the given figure of meter bridge experiment, the balancing length $A C$ corresponding to null deflection of the galvanometer is $40 c m$ . The balancing length, if the radius of the wire $A B$ is doubled, will be _____ $c m$ .

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Even if the radius of wire is doubled, the balancing point would not change as l − x x ​ = R 2 ​ R 1 ​ ​ , which is independent of area in case of uniform wire. Thus, the balancing length remains the same i.e., 40 c m .

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