The figure shows a meter bridge circuit with A B=100 cm, X=12 Ω and R=18 Ω and the jockey J in t...

The figure shows a meter bridge circuit with A B=100  cm, X=12 Ω and R=18 Ω and the jockey J in the position of balance. If R is now made 8 Ω, through what distance will J have to be moved to obtain balance?
(a) 10  cm
(b) 20  cm
(c) 30  cm
(d) 40  cm

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