# Dipole help

1. Feb 23, 2008

### apw235

1. The problem statement, all variables and given/known data
A dipole sits a distance d above a point charge q which is located at the origin of our coordinate system. In (a) it is aligned in the z direction and in (b) in the y direction. Calculate the energy, force, and torque of the dipole in the field of the charge.
(see attachment)

2. Relevant equations
U=-$$\vec{P}\bullet\vec{E}$$ Energy
$$\tau=\vec{P}\times\vec{E}$$ Torque

3. The attempt at a solution
For (b) it is clear that the Torque is 0, but that is about all i've figured out so far...

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