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A conducting spherical shell having inne...

A conducting spherical shell having inner radius a and outer radius b carries a net charge Q. If a point charge q is placed at the centre of this shell, then the surface charge density on the outer surface of the shell is given as:

A

`(Q-p)/(4pib^(2))`

B

`(Q+q)/(4pib^(2))`

C

`(Q-q)/(4pib^(2))`

D

Zero

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