Question

In any question referring to current, conventional current will be used (where conventional current is the flow of positive charges). In addition, all effects due to the earth's magnetic field will be so small that they will be ignored. Note that the term "particle" is meant to be an object without size or structure. 1. A hollow metal sphere is electrically neutral (no excess charge). A small amount of negative charge is suddenly placed at one point P on this metal sphere. If we check on this excess negative charge a few seconds later we will find one of the following possibilities (a) All of the excess charge remains right around P (b) The excess charge has distributed itself evenly over the outside surface of the sphere. (c) The excess charge is evenly distributed over the inside and outside surface. (d) Most of the charge is still at point P, but some will have spread over the sphere. (e) There will be no excess charge left. A hollow sphere made out of electrically insulating material is electrically neutral (no excess charge). A small amount of negative charge is suddenly placed at one point P on the outside of this sphere. If we check on this excess negative charge a few seconds later we will find one of the following possibilities: (a) All of the excess charge remains right around P. (b) The excess charge has distributed itself evenly over the outside surface of the sphere. (c) The excess charge is evenly distributed over the inside and outside surface. (d) Most of the charge is still at point P, but some will have spread over the sphere. e) There will be no excess charge left. 2. For questions 3-5: Two small objects each with a net charge of +Q exert a force of magnitude F on each other. +Q We replace one of the objects with another whose net charge is +40: +Q +4 3. The original magnitude of the force on the +Q charge was F; what is the magnitude of the force on the +Q now? (a) 16F (b) 4F (c) F (d) F/4 (e) other 4. What is the magnitude of the force on the +4Q charge? (a) 16F (b) 4F (c) F (d) F/4 (e) other

Answer 1

(1) AB negative charge consists of electrons. On butting on neutral metal hollow sphere, charge distributes itself evenly over the outer surface of sphere because It brings electrostatic Ć equilibrium. Ansurer (6)