A point charge $+q$ is placed at the centre of a cube of side $\mathrm{L}$. The electric flux emerging from the cube is

• Correct answer
  A

  $\frac{q}{\varepsilon_0}$
• B

  Zero
• C

  $\frac{6 q L^2}{\varepsilon_0}$
• D

  $\frac{q}{6 L^2 \varepsilon_0}$

Hence, the correct answer is option: 'A'.