Suppose that a parallel-plate capacitor has circular plates with radius r = 25 mm and a plate separation of 4.7 mm. suppose also that a sinusoidal potential difference with a maximum value of 160 v and a frequency of 60 hz is applied across the plates: that is, v = (160 v) sin[2π(60 hz)t].(a) findbmax(r), the maximum value of the induced magnetic field that occurs at r = r. (b) plotbmax(r) for 0 < r < 10 cm.