The volume charge density of a sphere of radius 6 m is 2 μ C cm^-3. The number of lines of force per unit surface area coming out from the surface of…

The volume charge density of a sphere of radius $\displaystyle 6$ m is $\displaystyle 2 \mu \mathrm{C} \mathrm{cm}^{-3}$. The number of lines of force per unit surface area coming out from the surface of the sphere is \_\_\_\_ $\displaystyle \times 10^{10} \mathrm{NC}^{-1}$. [Given : Permittivity of vacuum $\displaystyle \epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1}-\mathrm{m}^{-2}$ )