Question

The terminal voltage is $\frac{E}{2}$ when a current of $2A$ is flowing through $2\Omega$ resistance, then the internal resistance of cell is :-

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

Terminal potential $V=IR$ or $E/2=2\times 2\Rightarrow E=8$
Also, $V=E-Ir$
or $E/2=E-Ir$ or $r=E/2I=8/(2\times 2)=2\Omega$