A Parallel-Plate Capacitor Has Closely Spaced Circular Plates of Radius $\mu$

Multiple Choice

A parallel-plate capacitor has closely spaced circular plates of radius R = 3.00 cm.Charge is flowing onto the positive plate at the rate I = dQ/dt = 3.65 A.The magnetic field at a distance r = 1.50 cm from the axis of the plates is approximately

A) 135 mT
B) 256 $\mu$ T
C) 1.35 $\mu$ T
D) 457 mT
E) 88.3 $\mu$ T