A point charge + `mu` c is a distance 5 cm directly above the centre of a square of side 10 cm as what is the magnitude of the electric flux through the square

Explanation

Situation given in the statement is equivalent to following situation.

Here given point charge `q= 10 muC` can be considered to be at the centroid of a cube of side length 10 cm. This position of charge is symmetric to all the six identical faces of a cube. Hence, total electric flux `phi_(t)` emanating from charge q is shared equally by these six faces. Hence, electric flux passing through one face (bottom face given in the statement) will be,
`phi = 1/6 phi_(t)`
`=1/6 (q/epsilon_(0))`
`=(10 xx 10^(-6))/(6v xx 8.85 xx 10^(-12))`
`therefore phi = 1.883 xx 10^(5) Nm^(2)//C`