A Parallel-Plate Capacitor , Made of Two Circular Plates of Radius

Multiple Choice

A parallel-plate capacitor , made of two circular plates of radius R = 10 cm, is being charged. What is the magnitude of the induced magnetic field induced by the displacement current between the plates of the capacitor at a distance r = 2 cm from the axis of the plates at a time when the electric field varies at the rate dE/dt = 2 × 10¹² V/m s?

A) 0.7 × 10^-7 T
B) 2.2 × 10^-7 T
C) 8.1 × 10^-7 T
D) 3.5 × 10^-7 T
E) 1.3 × 10^-7 T