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Question:
There are two concentric shells. If the potential of inner shell is 10V ( radius r) and that of the outer shell is 5V (radius 2r) , then what will be the potential at the center ??
Answer:

circle

There are two concentric shells of radius r and 2r respectively.

So, as we know that the potential for a shell, inside it on each point is equal to the potential on its surface.

So, potential at the centre is equal to the potential on inner shell = 10 V

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