Equipotential Surfaces

 

        Equipotential Surface : a surface consisting of points having the same electric potential.

 

        The equipotential surface can be real ( plate ) or imaginary ( point charge ).

 

        Examples : Uniform field ( figure 25-3 a ), point charge ( figure 25-3 b ), electric dipole ( figure 25-3 c ).

 

        When a charged particle moves between any two points on an equipotential surface, the work done is zero { W = q x DV , DV = 0 , W is path-independent }.

 

         Equipotential surfaces are always perpendicular to the electric field lines.