Suppose that a circular parallel$-$plate capacitor has radius $r_0=3\mathrm{.}0cm$ and plate separation $d=5\mathrm{.}0mm.$ A sinusoidal potential difference $V=V_{0}sin(2ft)$ is applied across the plates, where $V_0=180V$ and $f=60Hz$

Part A

Choose the correct expression for the magnitude of the induced magnetic field in the region between the plates. $B_0(r)$ is a function of the radial distance $r$ from the capacitor's central axis.

$B=B_0(r)cos(2ft)$

$B=\frac{B_0(r)}{sin(2ft)}$

$B=B_0(r)sin(2ft)$

$B=\frac{B_0(r)}{cos(2ft)}$

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