Electric dipole

1. Jan 15, 2008

anap40

1. The problem statement, all variables and given/known data
4. An electric dipole lying along the z-axis consisting of a positive charge +q at position
z+d and a negative charge q at position z sits in an electric field that varies with position,
E = E(z). What is the net force on the dipole, in the limit d-->0 Write your answer in
terms of the dipole moment p = qd.

2. Relevant equations
F=qE

3. The attempt at a solution
http://img267.imageshack.us/img267/5956/imguu3.jpg