$A$ point charge causes an electric flux of $-2 \times 10^4 \ Nm^2 C^{-1}$ to pass through a spherical Gaussian surface of $8.0 \ cm$ radius,centred on the charge. The value of the point charge is: (Given $\epsilon_0 = 8.85 \times 10^{-12} \ C^2 N^{-1} m^{-2}$)
- A$-17.7 \times 10^{-8} \ C$
- B$-15.7 \times 10^{-8} \ C$
- C$17.7 \times 10^{-8} \ C$
- D$15.7 \times 10^{-8} \ C$
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