The Field of an Electric Dipole | For Points on the Dipole Axis

The electric field of an electric dipole at any point in space can be calculated by using Coulomb's law and the Superposition principle. Here we study two cases: (1) When the point is on the dipole axis, and (2) When the point is on the equatorial plane of the dipole.

For Points on the Dipole Axis

Let the point P be at distance r from the centre of the dipole on the side of the charge q, as shown in figure

   

The total electric field at P is

 E = E_{+q +} E_-q

    

    

     

 

     

    

 

 

 

  

          (p = 2qa)  

        

   

 

Related Articles

• The Field of an Electric Dipole | For Points on the Equatorial Plane of the Dipole

• Dipole Moment