Question 676: Current Electricity

Question

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

Accepted Answer

Since the galvanometer shows no deflection so current will flow as shown in the figure.
Current,
$$I = {{{V_A}} \over {{R_1} + R}} = {{12V} \over {\left( {500 + 100} \right)\Omega }} = {{12} \over {600}}A$$
$${V_B} = IR = \left( {{{12} \over {600}}A} \right)\left( {100\Omega } \right) = 2V$$

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 VA = 12 V, R1 = 500 $\Omega and R = 100 \Omega $ the galvanometer (G) shows no deflection. The value of Vs is

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