Current Electricity - Result Question 100
105. In the circuit shown the cells $A$ and $B$ have negligible resistances. For $V_A=12 V, R_1=500 \Omega$ and $R=100 \Omega$ the galvanometer $(G)$ shows no deflection. The value of $V_B$ is :
[2012]
(a) $4 V$
(b) $2 V$
(c) $12 V$
(d) $6 V$
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Answer:
Correct Answer: 105. (b)
Solution:
- (b)
Since deflection in galvanometer is zero so current will flow as shown in the above diagram.
current $I=\frac{V_A}{R_1+R}=\frac{12}{500+100}=\frac{12}{600}$
So $\quad V_B=I R=\frac{12}{600} \times 100=2 V$
