In the circuit shown the cells A and B have negligible resistances. For V_A=12 V, R_1=500 Ω and ...

In the circuit shown the cells A and B have negligible resistances. For V_A=12  V, R_1=500 Ω and R=100 Ω the galvanometer (G) shows no deflection. The value of V_B is
(a) 4  V
(b) 2  V
(c) 12  V
(d) 6  V
(2012)

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