In the circuit, the cells are having negligible resistances. If the galvanometer shows null defection then…

In the circuit, the cells are having negligible resistances. If the galvanometer shows null defection then the value of ' $\mathrm{V}$ ' is

1. $12 \mathrm{~V}$
2. $6 \mathrm{~V}$
3. $4 \mathrm{~V}$
4. $2 \mathrm{~V}$

Solution

Apply the Kirchoff law $\begin{aligned} & -12+500 \mathrm{i}+100 \mathrm{i}=0 \\ & 600 \mathrm{i}=12 \\ & \mathrm{i}=\frac{12}{600}=0.02 \mathrm{~A} \\ & \mathrm{~V}=\mathrm{iR}=100 \times 0.02=2 \mathrm{~V} \end{aligned}$

Asked in: AP EAMCET 2023 (17 May Shift 1)

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