A point charge of  +12  μC is at a distance 6 cm vertically above the centre of a square of side 12 cm as shown in fig. The magnitude of the electric flux through the square will be ……..×103 Nm2/C :

Imagine, +q charge to be at center of an imaginary cube of side 12cm.Flux passing through cube = ϕ=qε0By symmetry, Flux passing through each face of cube = ϕ'=q6ε0=12×10−66×8.85×10−12=225.98×103  SI  units