Consider two concentric spherical surfac...

Consider two concentric spherical surfaces `S_1` with radius a and `S_2` with radius 2a, both centered at the origin. There is a charge +q at the origin and there are no other charges. Compare the flux `phi_1` through `S_1` with the flux `phi_2` through `S_2`.

`phi_1=2phi_2`

`phi_1=4phi_2`

`phi_1=phi_2 `

`phi_1=phi_2/2`

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