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18 January, 23:30

A conducting spherical shell of inner radius r1 and outer radius r2 has a charge Q on it. An additional charge, also Q, is then added to the sphere. What is the resulting charge per unit area on the outer surface of the sphere?

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  1. 19 January, 01:17
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    Since the spherical shell is conducting, all the charge will lie on the outer surface.

    Total charge

    = Q + Q = 2Q

    surface area = 4πr₂²

    surface charge density = charge / surface area

    = 2Q / 4πr₂²
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