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Solution: A constant current I is supplied for a brief time to charge a parallel plate capacitor. The capacitor has circular plates of radius R with gap d (d << R). Point 1 is at R + d from the wire, and point 2, is at a distance R + d from the center of the capacitor. During the time interval that the constant current I is flowing through the capacitor, the magnetic field at point 2, B2 is: a) B2 > B1 b) B2 = B1 c) 0 < B2 < B1 d) B2 = 0 e) not enough information to tell

Problem

A constant current I is supplied for a brief time to charge a parallel plate capacitor. The capacitor has circular plates of radius R with gap d (d << R). Point 1 is at R + d from the wire, and point 2, is at a distance R + d from the center of the capacitor.

During the time interval that the constant current I is flowing through the capacitor, the magnetic field at point 2, B2 is:

a) B2 > B1

b) B2 = B1

c) 0 < B2 < B1

d) B2 = 0

e) not enough information to tell