Further, In physics video lectures for iit jee we have discussed cases based on force.

1. If the two charges are opposing each other, i.e. one is negative and other is positive then the force is positive and attractive force exists between them.
2. If two charges are same, i.e. both of them are positive or negative then the force is opposing and repulsive force exists between them.

Further, we have discussed the principle of superpositions of force and electric field lines and properties. A few of the properties of electric field lines discussed are,

1. They give the direction of the electron and the direction of positive charge.
2. These lines do not cross intersect each other.
3. These flux line repel each other perpendicular to the length.
4. They can never pass through metals. But, in some case exits inside it.
5. Along the flux lines the potential decreases.
6. Electric flux ends or emerges normally to the surface of the metal.

Then we have discussed electric field due to a point charge and electric potential. 

The electric potential at a point is equal to work done by an external agency to bring a unit charge from infinity.

Then we have talked about the relation between electric field and electric potential. Then we have discussed a very important law – the Gauss’s law. Further, we have talked about the application of Gauss’s law. Further, we have talked about the electric field due to,

1. Linear charge distribution.
2. A plain sheet of charge.
3. Near a charged conducting body.
4. A conducting sphere.
5. A charged conducting sphere.

There is way more discussed in the chapter. This topic of jee lecture of physics is simple at the same time a little complex. One has to make sure that they perfect the basics of this chapter well, in order to master this chapter.