Question 647: Current Electricity

Question

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
s
is
![](https://neetcare-image.cdn.examgoal.net/1qpqahkk7y2uq57/9f601ff4-9a45-4982-a235-041487df950f/26c761c0-6981-11ea-aedc-f1c8d8e0194b/file-1qpqahkk7y2uq58-500w.jpg)

Accepted Answer

Since the galvanometer shows no deflection so current will flow as shown in the figure.
Current,
$I = {{{V_A}} \over {{R_1} + R}} = {{12V} \over {\left( {500 + 100} \right)\Omega }} = {{12} \over {600}}A$
${V_B} = IR = \left( {{{12} \over {600}}A} \right)\left( {100\Omega } \right) = 2V$
![](https://neetcare-image.cdn.examgoal.net/1qpqahkk7y2aedw/918ba5eb-4ecb-4128-8749-febb8ab9e964/f1832140-697e-11ea-aedc-f1c8d8e0194b/file-1qpqahkk7y2aedx-357w.jpg)

Answer

4 V

Answer

2 V

Answer

12 V

Answer

6 V

Current Electricity

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 s is

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