Q.

In the given circuit of fig.no current is passingthrough the galvanometer connected to a meter bridge. Distance 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 / 2

b

2X

c

X

d

None of  these

answer is C.

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Detailed Solution

When Wheatstone bridge is balanced, thenR1R2= resistance of AC part  resistance of BC part When the diameter of the wire is doubled, the ratio of R.H.S. remains the same. Hence the value of ,AC (= x) remains the same,
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In the given circuit of fig.no current is passingthrough the galvanometer connected to a meter bridge. Distance AC corresponding to null deflection of galvanometer is x. What would be its value if the radius of the wire AB is doubled ?