If the electric flux entering and leavin...

If the electric flux entering and leaving an enclosed surface are `phi_1` and `phi_2` respectively, then the electric charge inside the surface will be

`(phi_2-phi_1)**epsi_0`

`(phi_1+phi_2)/epsi_0`

`(phi_1-phi_2)/epsi_0`

`epsi_0(phi_1+phi_2)`

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