First: A rigid electric dipole is free to move in the electric field in the pic... http://img53.imageshack.us/img53/6950/untitled8kz.jpg [Broken] Which one of the following phrases most accurately describes the initial motion of the dipole if it is released from rest in the position shown? The Answer is: "It moves to the left" Why does it move to the left? Second: A metal sphere is radius 8 cm is charged to a potential of -500V. With what velocity must an electron be fired toward the sphere if it is to just barely reach the sphere when started from a position of 15 cm from the center of the sphere? Help would be greatly appreciated. These were test questions, and I got them wrong.