Question

A parallel plate capacitor (Fig. 8.7) made of circular plates each of radius R = 6.0 cm has a
capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad s^−1.
(a) What is the rms value of the conduction current?
(b) Is the conduction current equal to the displacement current?
(c) Determine the amplitude of B at a point 3.0 cm from the axis between the plates.

Answer 1

Radius of each circular plate, R = 6.0 cm = 0.06 m
Capacitance of a parallel plate capacitor, C = 100 pF = 100 × 10⁻¹² F
Supply voltage, V = 230 V
Angular frequency, ω = 300 rad s⁻¹