Question

Charge q is placed at the corner of a cube of a side l. Find electric flux passing through the cube​

Answer 1

If charge is at the corner then it will be shared by 8 cubes.

Charge for 1 cube = q/8

Now in any given cube it is touching 3 9f its faces. So the area vector of that side and the electric field vector will be perpendicular. So flux through those 3 sides will be 0.

Equal amount of flux will flow from the other 3 sides.

So flux through 1 side = (q/8)/3 = q/24.

Hope that helps.