A point charge causes an electric flux of $-2 \times 10^4 \mathrm{Nm}^2 \mathrm{C}^{-1}$ to pass through a spherical Gaussian surface of 8.0 cm radius, centred on the charge. The value of the point charge is : (Given $\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}$ )

• A

  $15.7 \times 10^{-8} \mathrm{C}$
• B

  $17.7 \times 10^{-8} \mathrm{C}$
• C

  $-15.7 \times 10^{-8} \mathrm{C}$
• Correct answer
  D

  $-17.7 \times 10^{-8} \mathrm{C}$

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