## PHYS208 Fundamentals of Physics II

### Quiz 3 -- Bonus Question

Find the effective dipole moment far away from a split-ring of charge.

We would like to examine the electric field far from the ring and compare to the
field dependence of a point dipole. A point away from the center must be considered
so that we may consider the limit far away. There are two possibilities that should give the same answer
far away:
*Answer:* Effective dipole moment is
*p* = (4 *Q a*) / *pi*.

"http://www.physics.udel.edu/~watson/phys208/quiz3extra1.html"

Last updated Oct. 27, 1997.

Copyright George Watson, Univ. of Delaware, 1997.