(a) Define electric flux. Is is the scalar or a vector quantity?
A point charge q is at a distance of `d//2` directly above the centre of a square of side d, as shown in the figure. Use Gauss's law to obtain the expression for the electric flux through the square.
(b) If the point charges is now moved to a distance 'd' from the centre of the square and the side of the square is doubled, explain how the electric flux will be affected.