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**Potential at ANY point on a spherical shell due to external point charge**

Hi everyone

Here is another problem:

A point charge q is placed at a distance of r from the center of an uncharged conducting sphere of radius R (< r). Find the potential at

**any**point on the sphere.

I know the answer is

[tex]\frac{1}{4\pi\epsilon_0}\frac{q}{r}[/tex]

but I want to do it rigourously. Any suggestions?

Thanks,

Vivek

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