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

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, B_{2} is:

a) B_{2} > B_{1}

b) B_{2} = B_{1}

c) 0 < B_{2} < B_{1}

d) B_{2} = 0

e) not enough information to tell