What is the net flux of the uniform electric field of Exercise15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes? | question and answer !

Question :-

What is the net flux of the uniform electric field of Exercise15 through a cube of side 20 cm oriented so that its faces are parallel to the coordinate planes?

Answer :-

All the faces of a cube are parallel to the coordinate axes. Therefore, the number of field lines entering the cube is equal to the number of field lines piercing out of the cube. As a result, net flux through the cube is zero.