If the electric flux entering and leaving an enclosed surface respectively is ${\mathrm{\varphi }}_1 \mathrm{and} {\mathrm{\varphi }}_2$, then the electric charge inside the surface will be

• A

  $\left({\mathrm{\varphi }}_1+{\mathrm{\varphi }}_2\right){\mathrm{\epsilon }}_{\mathrm{o}}$

• B

  $\left({\mathrm{\varphi }}_2-{\mathrm{\varphi }}_1\right){\mathrm{\epsilon }}_{\mathrm{o}}$

• C

  $\left({\mathrm{\varphi }}_1+{\mathrm{\varphi }}_2\right)/{\mathrm{\epsilon }}_{\mathrm{o}}$

• D

  $\left({\mathrm{\varphi }}_2-{\mathrm{\varphi }}_1\right)/{\mathrm{\epsilon }}_{\mathrm{o}}$