Question

State the rules of electric field lines for charges

Answer 1

Electric field lines always point away from a positive charge and towards a negative point. In fact, electric fields originate at a positive charge and terminate at a negative charge. Also, field lines never cross each other.

Thus, electric field lines can never intersect one another.

Answer 2

For a given group of point charges, the field lines always originate from positive charge and end in a negative charge. In case there is some excess charge then some lines will begin or end indefinitely.
For example, in the above figure q₁ is greater than q₂. The lines are originating in q₂, so charge q₂ is positive and in the charge q₁ some lines are coming from infinitely far away.
The number of lines drawn ending on a negative charge or leaving a positive charge is proportional to the magnitude of the charge.
So higher the charge more lines will leave from it if it is a positive charge or end in it if it is a negative charge.The field lines never cross each other