Consider 2 metals ,the smaller sphere has a radius of a carry +Q charges,what is the potential at the surface of the smaller sphere?
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closed as too localized by David Zaslavsky♦ Feb 5 '12 at 1:07
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.
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It is usually assumed that the potential at infinity is zero. The field between the outer surface of the larger sphere and infinity is the same as for a point charge $Q$ in the center (without any spheres), so you can calculate the potential at the outer surface of the larger sphere. The potentials of the outer and inner surfaces of the larger sphere are the same. The field between the smaller and the larger spheres is the same as for a point charge $Q$ in the center (without any spheres), so you can calculate the difference of the potentials at the surface of the smaller sphere and the inner surface of the larger sphere. |
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