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Current Electricity

Question

In the circuit shown the cells A and B have negligible resistances. For V_A = 12V, R₁ = 500Ω and R = 100Ω the galvanometer (G) shows no deflection. The value of V_B is

4V

2V

12 V

6 V

Solution

Applying Kirchoff's law
500I +100I = 12
So, I = 12 x 10^-2/6 = 2 x 10^-2
Hence, V_B = 100 (2 x 10^-2) = 2V