Q131 / 155 · WBJEE 2024 · Physics
Consider a circuit where a cell of emf $\mathrm{E}_0$ and internal resistance $r$ is connected across the terminal $A$ and $B$ as shown in figure. The value of $R$ for which the power generated in the circuit is maximum, is given by
Consider a circuit where a cell of emf $\mathrm{E}_0$ and internal resistance $r$ is connected across the terminal $A$ and $B$ as shown in figure. The value of $R$ for which the power generated in the circuit is maximum, is given by
- AR = r
- BR = 2r
- Correct answerCR = 3r
- D$\quad R=\frac{r}{3}$
Solution
Hint: $R_{\text {ext }}=r$
$$
\begin{aligned}
& \frac{R}{3}=r \\
& R=3 r
\end{aligned}
$$
Hence, the correct answer is option: 'C'.