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## Homework Statement

I got this problem from my physics textbook, and I'm not sure how to solve it.

A point charge R is distance p from the center of a diple consisting of charges + and - q separated by distance s.

The charge R is located in the plane that bisects the dipole.

What is the force (don't forget direction) on the dipole? Assume that p is much bigger than s.

## Homework Equations

Electric field due to a dipole: K2qs / r

^{3}, where s is the length of the dipole, q is the charge of the dipole, and r is distance from it.

## The Attempt at a Solution

The first thing I'm not sure about is the part that says "located in the plane that bisects the dipole". What does that mean?

I have decided to calculate the force of the dipole on the charge R, rather than the other way around.

So, the electric field due to the dipole is:

E = (K)(2qs) / (r

^{3}). Multiply this by R to get force.

However, I don't know how you figure out the direction! Next I have to figure out the torque on this so I will need to calculate the angle the dipole makes with the electric field.

Ideas?