Electric potential at a point in an electric field is defined as the amount of work done is bringing a unit positive charge from infinity to that point.
\(V=\frac{W}{q_0}J/C\,or\,V\)
Electric Potential Difference : The work done per unit charge in carrying a positive test charge from one point to the other point in the electric field is called potential difference.
VA -VB = W/q0
The potential inside the spherical shell is zero.
Equipotential Surface : It is an imaginary surface such that all the points on the surface have same potential in an electric field.
The electric field lines are perpendicular to equipotential surface.
Electric Potential Energy : The electric energy of a system
of charge is the work that has been done in bringing those charges from infinity to near each other to from the system.
\(U=\frac{1}{4\pi \epsilon_0}\,\frac{q_1q_2}{r^ 2}\,J\)
