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A charge Q is distributed over two concentric hollow spheres radii a and b (b>a) such that their source charge densities are equal. Find the potential at the their common center

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We're not here to do your homework... Explain where you are stuck – Chris Gerig Jun 14 '12 at 19:30
Hi TheGuru, and welcome to Physics Stack Exchange! As Chris said, questions like this aren't appropriate for this site; see our FAQ and homework policy for some information on how to write an appropriate homework question. Basically, you can improve your question by asking about the concept that is giving you trouble (i.e. where you're stuck), not just posting the problem. If you do that, I'll be happy to reopen this. – David Zaslavsky♦ Jun 14 '12 at 20:45

closed as too localized by David Zaslavsky♦ Jun 14 '12 at 20:43

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.