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Q.

In the shown arrangement of a meter bridge, if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?

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a

x

b

x/4

c

4x

d

2x

answer is A.

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Detailed Solution

R1R2=R3R4=x100-x. If the radius of the wire is doubled then the resistance AC is changed so does the value of resistance CB. So R1R2remains unchanged.

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In the shown arrangement of a meter bridge, if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled?