$$

$11202$:$22$

$$

$3$

$1$

A $12-V$ battery has an internal resistance of $0\mathrm{.}20.$ If the battery is being charged by a current of $30$ A $,$ the magnitude of the potential difference between its terminals is

$6\mathrm{.}0$ V

$42$ V

$0$

$12$ V

$18$ V