It is a region around a charged body, where another charge experiences an electric force. This force will not be same at the all points of an electric field. As we go away from charged body this force decreases. And the force experienced by the test charge at a point per unit charge is the measure of intensity of field at that point in the direction of force; this force depends upon the intensity of the field at any point. If the intensity at any point is greater, the force will also be greater at that point. So as we go away from the charge intensity of electric field also decreases.

Force in terms of intensity (E) and point charge q₀ can be defined mathematically as,