Question

The relation between R and r ( internal Resistance of the battery) for which the power consumed in the external part of the circuit is maximum

• A. $R=r$
• B. $R=\frac{r}{2}$
• C. $R=2r$
• D. $R=1.5r$

Answer 1

The correct option is A $R=r$

This circuit is Wheatstone bridge

$\begin{array}{c}\frac{a}{b}:\frac{c}{d}=\frac{1}{2}:\frac{1}{2}\\ Hence,\\ R_{net}=2\Omega \\ \therefore r-2\Omega \end{array}$