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The figure shows a meter bridge circuit ...

The figure shows a meter bridge circuit with AB=100 cm, X=`12 Omega andR=18 Omega` and the jockey J in the position of balance. If R is now made `8Omega` through what distance will J have to be moved to obtain balance?

A

10 cm

B

20 cm

C

30 cm

D

40 cm

Text Solution

Verified by Experts

The correct Answer is:
B
`(X)/(R) = (AJ)/(JB)` for balance
Initially, `(12)/(18) = (AJ)/(100 - AJ)` finally
`(12)/(8) = (AJ')/(100 - AJ')` or `AJ' = AJ = 20 cm`.
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