A 0.500-cm-radius plastic sphere, used in a static electricity demonstration, has a uniformly distributed 40.0-pC charge on its surface. What is the electric potential just outside the sphere’s surface?
A Van de Graaff generator holds a charge of 5.20 mC. A point is located at a distance of 7.12 m from the center of the generator’s top terminal.
What is the magnitude of the electric field at the point ?
What is the magnitude of the force exerted by the generator’s top terminal on a 4.51 µC charge located at the point ?
How much energy is stored in the electric field of a metal sphere of radius 1.0 m that is kept at a 42 V potential?