A metal sphere with $1 \mathrm{~m}$ radius and a surface charge density of $10 \; \mathrm{Coulombs / m}^{2}$ is enclosed in a cube of $10 \mathrm{~m}$ side. The total outward electric displacement normal to the surface of the cube is
- $40 \pi$ Coulombs
- $10 \pi$ Coulombs
- $5 \pi$ Couloms
- None of these