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In the shown arrangement of the experime...

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

A

x

B

`x//4`

C

`4x`

D

`2x`

Text Solution

Verified by Experts

The correct Answer is:
A
a. At null point `R_1//R_2 = R_3//R_4 = x//(100-x)`. If radius of the
wire is doubled, then the resistance of CB will change. But since `R_1//R_2` does
not change, so `R_3//R_4` should also not
change at null point. Therefore, the
point C does not change.

`R prop 1/A, R_3/R_4 = A_4/A_3 = 1 `.
Ratio does not change.
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