Answer to Question #55046 in Electricity and Magnetism for Hoa

Question

7- A uniform charge of +Q is placed on the sphere of a
Van de Graaff generator, such that electron discharge is observed from a conducting point a distance of 46 cm away ( center to center). Assume the dielectric strength of air, E = 3x10^6 N/C
(a) Determine the electric potentials at the 100 cm and 80 cm radial location
(b) A small air balloon of charge q=-8.4nC mass 1.52 grams, is placed at rest at the 100 cm potential surface, and then released. Determine its speed v at the 80cm radial location ( neglect any air resistance and work = ΔK)