Eight charges, 1muC, -7muC , -4muC, 10muC, 2muC, -5muC, -3muC, and 6muC`, are situated at the eight cornersof a cube of side 20 cm. A spherical surface of radius 80 cm encloses this cube. The center of the sphere coincides with the center of the cube. Then, the total outgoing flux from the spherical surface (in units of Vm) is

Options

A. `36 pi xx 10^3`
B. `684 pi xx 10^3`
C. zero
D. none of these

Answer

C

Explanation

c. `1-7-4+10 +2 - 5 - 3 +6 = 0`
Sum of all the charges is zero, so net flux is zero.