Consider a (Two-Dimensional) Ring of Positive Charge, Uniformly Distributed

Multiple Choice

Consider a (two-dimensional) ring of positive charge, uniformly distributed. The force on a negative charge Q placed at a point P* located a small distance (along an axial line, perpendicular to the plane of the ring) from the geometric center of the ring acts as if it

A) "repels" Q from P* along an axial line.
B) "attracts" Q to P* along an axial line.
C) "repels" (or "attracts") Q from (or to) P* along a line in the plane of the ring.
D) is precisely zero.