Part A

If the root$-$mean$-$square current in an ac circuit is $10\mathrm{.}0$ AA $,$ the current amplitude is approximately

$7\mathrm{.}07$ AA $\mathrm{.}5\mathrm{.}00$ AA $\mathrm{.}14\mathrm{.}1$ AA $\mathrm{.}20\mathrm{.}0$ AA $.$