#
PHYS208 2/27 Class

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## The Electric Dipole

We will finish the previous class and then discuss the electric dipole with the time that remains.

### The Electric Dipole

The theme of today's class is the binomial theorem.
First, each of the expressions for **E** was calculated at an arbitrary distance
from the charge distribution;
then the expression was considered in the limit far away from each charge distribution.
The charged disk was seen to behave as a point charge far away.
The dipole was found to have an **E** field which fell off as r^{-3},
rather than r^{-2} as for the point charge.

The binomial theorem plays a big role in allowing us to check the limiting behavior of expressions that we derive.

**Another Dipole Example:**** Quiz 3 extension, Fall'97** --
not for the faint hearted...

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"http://www.physics.udel.edu/~watson/phys208/clas0227.html"

Last updated March 10, 1998.

Copyright George Watson, Univ. of Delaware, 1997.