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

  • 4V

  • 2V

  • 12 V

  • 6 V

Answer

B.

2V

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

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