Question

In the circuit, the potential difference across the capacitor is 10v each resistance of 3$\Omega$ the cell is ideal. the emf of the cell id

• A. 14V
• B. 16 V
• C. 18 V
• D. 24 V

Answer 1

The correct option is A 14V

$\begin{array}{c}{R}_{eq}=\frac{3R}{4}+R=\frac{7R}{4}\\ i=\frac{E4}{7R}\\ \Rightarrow V_o+iR+\frac{i}{4}R=V_A\\ \Rightarrow 0+\frac{4E}{7}+\frac{E}{7}=10\\ \Rightarrow \frac{5E}{7}=10\\ E=\frac{70}{5}=\frac{70}{5}=14V\\ Hence,\\ optionAiscorrectanswer.\end{array}$