Electric Field Of A Line Charge. The radial part of the field from a charge element is given by. The result will show the electric field near a line of charge falls off as , where is the distance from the line.
Let the linear charge density of this wire be λ. Following are the rules for drawing electric field lines: The electric field intensity at any point due to a system or group of charges is equal to the vector sum of electric field intensities due to individual charges at the same point.