The electrostatic potential `(phi _r)` of a spherical symmetric system , kept at origin is shown in the adjacent figure, and given as
`phi _e = q/( 4 pi varepsilon_0 r) (r ge R_o)`
`phi _e = q/( 4 pi varepsilon_0 R_o) (r le R_0)`

Which of the following option `s` in //are correct ?

Options

A. For spherical region `r le R_(0)`, total electrostatic energy stored is zero.
B. Within `r=2R_(0)`, total charge is q.
C. There will be no charge anywhere except at `r=R_(0)`.
D. Electric field is discontinuous at `r=R_(0)`

Answer

A, B, C, D