Question

If the external resistance is equal to the internal resistance of a cell of emf E, the P.D across its terminals is :

• A. $E/2$
• B. $E$
• C. $2E$
• D. zero

Answer 1

The correct option is A $E/2$

$\Rightarrow r=r$
$\Rightarrow E=I\left[2R\right]$
$I=\frac{E}{2R}$
P.D across cell $=$ P.D across R
$=IR$
$=\frac{E}{2}$