Question

Points of 6 microcoulomb is kept at a distance of 20cm directly above centre of square of side 40 cm the magnitide of flux through the square is

Answer 1

By symmetry of six faces of a cube

Total electric flux Φ = 6 X Flux through square

∴ Flux through square

   = (1/6)Φ = (1/6) X q X (1/ε₀)

   = (1/6) X 10 X 10⁻⁶ X ( 1/(8.85 X 10⁻¹²))

   = 1.88 X 10⁵ Nm²C⁻¹

Hope this helps you. :)