Question

Consider a uniform electric field $E=3\times {10}^3\hat{i}N{C}^{-1}$. What is the net flux of the uniform electric field through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes?

Answer 1

Faces of cube are parallel to the coordinate axes. Therefore, the number of field lines entering the cube is equal to the number of field lines coming out of the cube, making the net flux zero through it.