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Q.

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

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a

6 V

b

2 V

c

12 V 

d

4 V

answer is B.

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Detailed Solution

Since deflection in galvanometer is zero so current will flow as shown in the above diagram.

current I=VAR1+R=12500+100=12600

So VB=IR=12600×100=2 V

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