MHT CET Physics question

Accuracy with a meter bridge is maximum, when the null point is obtained at the midpoint of the bridge wire. This is because

(A)The error due to non uniformity of diameter of the wire is minimum in that case.
(B)The error due to the end resistance is minimum.Correct
(C)The error due to heating up of wire is minimum.
(D)The error due to faulty galvanometer is minimum.

Answer: (B)

Solution

At the midpoint both segments are long, so the end resistances (contact/connecting strips) form the smallest fraction of each

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Question ID VK-044994