Question

.. In the circuit shown the cells A and B have negligible
resistances. For VA - 12 V, R, - 500 and
R - 100 the galvanometer (G) shows no
deflection. The value of VB is

(1) 12 V
(2) 6 V
(3) 4 V
(4) 2 V​

Answer 1

Answer:

2V

Apply first Law of Kirchhoff

[I = 0

V-12//500 + V/100 = 0

V = 2V

.

Junction Potential = 2V

Vb is also 2V

because Current not flow ( zero deflection)