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  • In the shown arrangement of the experiment 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?

In the shown arrangement of the experiment 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?

Option: 1

x


Option: 2

\frac{x}{4}


Option: 3

4x


Option: 4

2x


Answers (1)

best_answer

At null point, \mathrm{\frac{R_1}{R_2}=\frac{R_3}{R_4}=\frac{x }{(100-x)}}. If radius of the wire is doubled, then the resistance of A C will change and the resistance of C B will also change. But since \mathrm{\frac{R_1}{R_2}} does not change, so \mathrm{\frac{R_3}{R_4}} should also not change at null point. Therefore, point C does not change

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chirag

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