The inward and outward electric flux for a closed surface in units of N-m²/C are respectively 8 x 10³ and 4 x 10³. Then the total charge inside the surface is: [where ${\mathrm{\epsilon }}_0$ = permittivity constant]

• A

  $4\times {10}^3\mathrm{C}$

• B

  $-4\times {10}^3\mathrm{C}$

• C

  $\frac{{\displaystyle \left(-4\times {10}^3\mathrm{C}\right)}}{\mathrm{\epsilon }}\mathrm{C}$

• D

  $-4\times {10}^3{\mathrm{\epsilon }}_0\mathrm{C}$