A metallic shell of inner radius a and o...

A metallic shell of inner radius a and outer radius b is carrying a charge Q. Another point charge `-q` is placed at the centre of the shell. Then the electrostatic potential of the shell is `(k=1/(4piepsilon_0))`

`(KQ)/a`

`K(Q-q)/R`

`K(Q-q)/b`

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