A thin walled spherical conducting shells `S` of radius `R` is given charge `Q`,the same amount of charge is also placed at its centre `C`.Which of the following statements are correct.

Options

A. On the outer surface of S, the charge density is `(Q)/(2piR^(2))`.
B. The electric field is zero at all points inside S.
C. At a point just outside S, the electric field is double the field at a point just inside S.
D. At any point insidde S, the electric field is inversely proportional to the square of its distance from C.

Answer

A, C, D