Answer
$X_C = 16.6~\Omega$
Work Step by Step
We can find $X_C$:
$X_C = \frac{1}{\omega_d~C}$
$X_C = \frac{1}{2\pi~f_d~C}$
$X_C = \frac{1}{(2\pi)~(400~Hz)~(24.0\times 10^{-6}~F)}$
$X_C = 16.6~\Omega$
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