, , The figure shows a metre-bridge circuit, with AB=100 cm, X=12 Ω and R=18 Ω, and the jockey J...

, , The figure shows a metre-bridge circuit, with AB=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?
(B) 20  cm
(A) 10  cm
(D) 40  cm
(C) 30  cm,

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