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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

40 cm

D

60 cm

Text Solution

Verified by Experts

The correct Answer is:
B
Initially, `(l_(1))/(100-l_(2))=(X)/(R)=(2)/(3)" ":.l_(1)=(2)/(5)xx100=40cm`
Finally, `(l_(2))/(100-l_(2))=(X)/(R)=(2)/(3)" ":.l_(2)=(3)/(5)xx100=60cm`
`:.` J is displaced by `l_(2)-l_(1)=20cm`
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