PHYS208 Fundamentals of Physics II
Hint for Ch. 23, 25P
Remember the geometry that I set up for the conjugate pairs in the case of the charged ring.
Switch to opposite charges and adjust the E contributions accordingly.
First Hint for Ch. 23, special problem
Consider charge elements that are conjugate about the perpendicular bisector of P.
The contribution to E from the negative and positive infinitesimal elements will
combine to point down, horizontal components cancelling. The result for the point
dipole (Ch. 23: 25P) can be used for the conjugate pair and the linear charge
density integrated from 0 to a.
Second Hint for Ch. 23, special problem
If you span the charge distribution as shown,
the following integral should result...
with the direction of E downward.
Last updated Feb. 27, 1998.
Copyright George Watson, Univ. of Delaware, 1997.