Hello Dear Studentsbr br In this Physics video lecture for class 12 we talked about electric field lines, their properties.br br Electric field lines in an electric field are imaginary lines, the tangent to which, at any point, gives the direction of the electric field intensity.br or we can say, an electric field line is a path along which a positive charge would move if it is free to do so.br br Few properties of electric field lines:-br br 1.The electric lines of force are imaginary lines.br br 2. A unit positive charge placed in the electric field tends to follow a path along the field line if it is free to do so.br br 3. The electric lines of force emanate from a positive charge and terminate on a negative charge.br br 4. The tangent to an electric field line at any point gives the direction of the electric field at that point.br br 5. Two electric lines of force can never cross each other. br br 6. Electric lines of force are closer(crowded) where the electric field is stronger and the lines spread out where the electric field is weaker.br br 7. Electric lines of force are perpendicular to the surface of a positively or negatively charged body.br br br 8. Electric lines of force do not pass through a conductor. Hence, the interior of the conductor is free from the influence of the electric field.