University Physics with Modern Physics (14th Edition)

$C=1.33\times10^{-5}F$.
$X_C=\frac{V}{I}=\frac{170V}{0.850A}=200\Omega$ Solve $X_C=\frac{1}{2 \pi fC}$ for the capacitance. $C=\frac{1}{2 \pi fX_C}=\frac{1}{2 \pi (60.0Hz)( 200\Omega)}=1.33\times10^{-5}F$