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A spherical shell of radius R is given c...

A spherical shell of radius `R` is given charge `3q` on its surface and a point charge `q` is placed at distance `R//2` from its centre `C`. Also there is a charge `2q` placed outside the shell at a distance of `2R` as shown. Then

A

The magnitude of electric field at the centre `C` due to charge on the outer surface of shell is `(Kq)/(2R^(2))` before closing the switch `S`

B

The electric potential at the centre `C` due to charges on the outer surface of shell is `((-Kq)/R)` before closing the switch `S`

C

The electric potential at the centre `C` due to charges on the outer surface of shell is `((-Kq)/R)` after closing the switch `S`.

D

Charge flown through the switch in to earth after closing the switch `S` is `5q`

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The correct Answer is:
A, C, D
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