Question
Define the term electric field intensity. Write its SI unit. Derive an expression for the electric field intensity at a point on the axis of an electric dipole.
Solution
The force experienced by a unit positive charge placed at a point is termed as the electric field intensity at that point.
It is vector quantity and it’s direction is in the direction of force acting on +ve test charge.
The SI unit of electric field intensity is NC–1.
Electric field at an axial point of electric dipole:
Assume point P is located at distance r from the centre of an electric dipole as shown in the figure.
