Fiitjee

IIT JEE 2015 Guidance › Electricity and magnetism questions › Fiitjee

There are 2 concentric metal shells of radii r1 and r2(>r1). If the outer shell has a charge q and the inner shell is grounded,,the charge on the inner shell is - _____ ?

Pls explain y charge is not 0 ??

#Physics #Electricity and magnetism

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2 Answers

106

Asish Mahapatra ·2009-07-26 04:14:19

outer shell has a charge q.
Let inner one have Q then the inner surface of outer has -Q and outer surface of outer shell has Q+q.
V_inner=0
So, kQ/r1 + kq/r2=0
so Q= -qr1/r2

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Gone.. ·2009-07-26 04:28:59

thanks asish..i carelessly thought that since it was grounded charge will be 0.

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