Refer to Section 17.7 for the potential along the axis of a ring of radius R carrying a charge Q. Let the axis of the ring be the z axis of the coordinate system, and determine Ez at any location z...

Refer to Section 17.7 for the potential along the axis of a ring of radius R carrying a charge Q. Let the axis of the ring be

the z axis of the coordinate system, and determine Ez at any location z along the axis. (If the charge is nearly uniformly

distributed around the ring, at these locations there is no Ex or Ey, due to the symmetry of the situation.) Compare with the

result obtained in the previous chapter by integration.