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\begin{figure}\centerline{ \psfig{file=problems/prob_1_4.eps,height=2.5in} }\end{figure}

Charges of $\pm q$ are located at both $z = \pm a/2$, respectively. This arrangement forms a electric dipole.

a) Find both the electric potential and electric field (magnitude and direction) at an arbitrary point $z > a/2$ on the z-axis.

b) What is the first nonzero term in the expansion of the electric field evaluated far from the charges, i.e. - for $z \gg a/2$?

Robert G. Brown 2003-02-09