In any question referring to current, conventional current will be used (where c

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. 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 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. Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with another whose net charge is -4Q: 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 (c) other What is the magnitude of the force on the +4Q charge? (a) 16F (b)4F (c)F (d)F/4 (e) other

Explanation / Answer

Explanation: The hollow metal sphere is a conductor . Now , when the negative chage particle is put on the sphere , charge distribution takes place between the sphere and particle and it gets uniformly distributed on the surface of the sphere due to conductivity of metal.

2.a)

   Explanation: The hollow metal sphere is an insultor now . Now , when the negative chage particle is put on the sphere , charge distribution does not take place between the sphere and particle and the charge is right around P.

3.b)

  Explanation: Force is directly proportional to product of charges involved.

4.b)

Explanation: Force is directly proportional to product of charges involved.

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