e , in two-
dimensions but we live in three-dimensions So if one wishes
to estimate the density of field lines, one has to consider the
number of lines per unit cross-sectional area, perpendicular
to the lines Since the electric field decreases as the square of
the distance from a point charge and the area enclosing the
charge increases as the square of the distance, the number
of field lines crossing the enclosing area remains constant,
whatever may be the distance of the area from the charge