A uniformly charged conducting sphere of radius 1.3 m has a surface charge density of $70 μC\, m^{-2}$. What is the total electric flux leaving the surface of the sphere?

$5.9×10^8 N\, m^2\, C^{-1}$ $1.7×10^{-8} N\, m^2\, C^{-1}$ $1.7×10^8 N\, m^2\, C^{-1}$ $6.4 × 10^{-8} N\, m^2\, C^{-1}$

$1.7×10^8 N\, m^2\, C^{-1}$

The correct answer is Option (3) → $1.7×10^8 N\, m^2\, C^{-1}$