Consider two charges ±Q of equal magnitudes and opposite signs, separated by a distance d. Such an arrangement of charges, is called an electric dipole. Find the electric field at a point equidistant from the two charges, a distance x from their midpoint. What is the dependence on distance of this "dipole field" for x >> d?
Find the force on the previous dipole (+Q and -Q arrangement in the previous question) by:
- a homogeneous electric field
- The field created by a point charge located a distance 5d form the origin on the y axis (below th origin.
Consider the dipole as a whole (the force on it is the sum of the forces on each charge).