## PHYS208 Fundamentals of Physics II

### Answer for Ch. 23, 25P

downward

For r>>d, this result reduces to kp/r^{3}, where p = qd,
the dipole moment.

Thanks to Kate Manning for inquiring about the far-field limit of the
exact formula.

"http://www.physics.udel.edu/~watson/phys208/exercises/answers/23-25P.html"

Last updated March 3, 1998.

Copyright George Watson, Univ. of Delaware, 1997.