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Q.

In the given potentiometer circuit, length of the wire AB is 3 m and resistance is R= 4.5  Ω.  The length AC for no deflection in galvanometer is

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a

2 m

b

1. 8 m

c

dependent on r1

d

none of these

answer is A.

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Detailed Solution

Potential gradient,x=50.5+4.5  4.53 = 1.5  V  m−1Here  x  AC  =  3  ⇒  AC=31.5  =  2m
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In the given potentiometer circuit, length of the wire AB is 3 m and resistance is R= 4.5  Ω.  The length AC for no deflection in galvanometer is