If a charge $q$ is placed at the centre of a closed hemispherical non-conducting surface, the total flux passing through the flat surface would be

• A

  $\frac{q}{{\epsilon }_0}$
• Correct answer
  B

  $\frac{q}{2{\epsilon }_0}$
• C

  $\frac{\mathrm{q}}{4{\epsilon }_0}$
• D

  $\frac{q}{2\pi {\epsilon }_0}$

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