Cavity An electric dipole p is in the center of a spherical cavity of radius R in a conducting material. We want to find the electric held everywhere by using a variation on the method of images. CONDUCTOR (a) Show that for a dipole in a uniform electric field, both parallel to the vertical axis, there exists a spherical surface where the electrostatic potential is zero. (b) Use the result of the above to find the electric field inside the cavity. (c) What is the surface charge in the surface of the sphere