Question

A point charge +10 µ C is a distance 5cm directly above the centre of a square of side 10cm, as shown in figure. What is the magnitude of the electric flux through the square?

Answer 1

consider that the charge q is at a distance of 5 cm from the square ABCD of each side 10cm as shown. The square ABCD can be considered as one of the six faces of a cube of each side 10cm. Then according to Gauss’ theorem, total electric flux through all the six faces of the cube,

ϕ = \(\frac{q}{\epsilon_0}\)

Obviously, the flux through the square ABCD will be,