Answer
$f=157.8Hz$
Work Step by Step
We can find the required frequency as follows:
$f=\frac{I_{rms}}{2\pi CV_{rms}}$
We plug in the known values to obtain:
$f=\frac{7.5\times 10^{-3}}{2\pi \times 0.015\times 10^{-6}\times 504}$
$f=157.8Hz$
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