Suppose that a parallel-plate capacitor has circular plates withradius R = 28 mm and a plate separation of 5.5 mm. Supposealso that a sinusoidal potential difference with a maximum value of140 V and a frequency of 77 Hz is applied across the plates; thatis,
V = (140 V) sin[2Ï€(77 Hz)t].
Find Bmax(R), the maximum value of theinduced magnetic field that occurs at r = R.
