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Question

A metal sphere A of radius r​​​​​​1 charged to a potential phi​​​​1 is enveloped by a thin walled conducting spherical shell B of radius r​​​​​​2 . Then potential phi​​​​2 of the sphere A after it is connected to the shell B by a thin conducting wire will be :-

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Solution

Here initially we have only a metal sphere of radius r1 with potential phi1 after that it is eneveloped by a spherical shell of radius r1 with potential phi2, So the cases are shown below

Hence the potential phi2= phi1 * r1/ r2

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