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Q.

The figure shows a meter-bridge circuit where X=12 Ω and R=18 Ω. The jockey J is at the null point. If R is made 8 Ω through what distance will the jockey J have to be moved to obtain null point again?

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a

10 cm

b

20 cm

c

30 cm

d

40 cm

answer is B.

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Detailed Solution

AJ100−AJ = XR = 1218 ⇒ AJ=40 cmAfter changing R:AJ'100−AJ' = 128 ⇒ AJ'=60 cmShifting : AJ' = 20 cm

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The figure shows a meter-bridge circuit where X=12 Ω and R=18 Ω. The jockey J is at the null point. If R is made 8 Ω through what distance will the jockey J have to be moved to obtain null point again?