If the electric flux entering and leaving a closed surface are $\phi_1$ and $\phi_2$ respectively,then the electric charge inside the surface will be:

  • A
    $(\phi_1 + \phi_2)\varepsilon_0$
  • B
    $(\phi_2 - \phi_1)\varepsilon_0$
  • C
    $\frac{\phi_1 + \phi_2}{\varepsilon_0}$
  • D
    $\frac{\phi_2 - \phi_1}{\varepsilon_0}$

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