Answer
The value of $Z$ decreases.
Work Step by Step
In part (d), we found that the new value of $X_C$ is $33.2~\Omega$
We can find $X_L$:
$X_L = \omega_d~L$
$X_L = 2\pi~f_d~L$
$X_L = (2\pi)(400~Hz)(0.150~H)$
$X_L = 377~\Omega$
The original value of impedance was $Z = 422~\Omega$
We can find the new impedance $Z$:
$Z = \sqrt{R^2+(X_L-X_C)^2}$
$Z = \sqrt{(220~\Omega)^2+(377~\Omega-33.2~\Omega)^2}$
$Z = 408~\Omega$
The value of $Z$ decreases.
