Question

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

• A. $36\pi \times {10}^3$
• B. $684\pi \times {10}^3$
• C. zero
• D. none of these

Answer 1

The correct option is C zero

Adding all the charges enclosed in the surface from which we need to calculate the flux.
1-7-4+10+2-5-3+6=0
Sum of the all charges enclosed is zero.
So, the net flux is zero.