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The figure shows a meter-bridge circuit,...

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

A

`10 cm`

B

`20 cm`

C

`30 cm`

D

`40 cm`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) `(AJ)/(100 - AJ) = (X)/(R ) = (12)/(18) implies AJ = 40 cm` After changing `R`:
`(AJ')/(100 - AJ') = (12)/(18) implies AJ' = 60 cm`
Shifting : `AJ' = AJ = 20 cm`
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