Suppose that a circular parallel$-$plate capacitor has radius r$0=3\mathrm{.}0$cmr$0=3\mathrm{.}0$cm and plate separation d$=5\mathrm{.}0$mmd$=5\mathrm{.}0$mm$.$ A sinusoidal potential difference V$=$V$0$sin$(2$ft$)$V$=$V$0$sin$(2$ft$)$ is applied across the plates, where V$0=180$VV$0=180$V and f$=60$Hzf$=60$Hz$.$ Choose the correct expression for the magnitude of the induced magnetic field in the region between the plates. B$0($r$)$B$0($r$)$ is a function of the radial distance rr from the capacitor's central axis.