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The figure, shows a metre bridge circuit...

The figure, shows a metre bridge circuit, with `AB = 100 cm, x = 12 Ω ` and `R = 18 Omega` and the jockey J in the position of the balance. If R is now made `8 Omega`, 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
`(12)/(18) =(l)/(100-l)`
`200 - 2l = 3l`
`l = 40 cm`
`(12)/(8)=(l')/(100-l')`
`300 = 5l'`
`l'=60 cm`
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