Answer to Question #27539 in Electricity and Magnetism for Mishal Khan BUKC

Question

Q#1 - Suppose that an electric field in some region is found to have a constant direction but to be decreasing in strength in that direction. What do you conclude about the charge in the region? Sketch the lines of force.

Q#2 -If a charge - q is distributed uniformly over the surface of a thin, insulated spherical metal shell of radius a, there will no electric field inside. If now a point charge +q is placed at the center of the sphere, there will be no electric field. This point charge can be displayed aa distance d<a from the center, but that givess the same dipole moment and creates an external field. How do you account for energy appearing in this external field?

Q#3 - A positive point charge q is located at the center of a hollow sphere. What charges appear on (a) the inner surface (b) outer surface (c) If you now bring an uncharged object near the sphere, will it change your answer to (a) or (b)? What will be the effect?