Consider two concentric spherical surface `S_(1)` with radius `a` and `S_(2)` with radius `2a` ,both centred on the origin. There is a charge `+q` at the origin, and no other charges.Compare the flux `phi_(1)` through `S_(1)` with the flux `phi_(2)` through `S_(2)`.

Options

A. `phi_(1)=4phi_(2)`
B. `phi_(1)=2phi_(2)`
C. `phi_(1)=phi_(2)`
D. `ph_(1)=phi_(2)//2`

Answer

C

Explanation

Flux through both will be same as net charge enclosed by both is same.