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 change). 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 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:

Explanation / Answer

1. Here two phenomena needs to be considered: (a) all the excess charge on any conductor resides on the surface, so that there could be no electric field inside the conductor ( using Gauss law); and (b) the charge on the outer surface of conductor distributed itself based the curvature (which in this case would mean uniform distribution, because of the law of capacitors). Hence the correct choice here would be option b.

2. Here since the sphere is an insulator so no charge can move about in or across the surface of the sphere hence all the charge would remain around P, i,e option a.

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