CLASS XII : ELECTROSTATICS :
NCERT textbook Exercise
Q: 1.7) (a) An electrostatic field line is a continuous curve. That is a field line cannot have sudden breaks. Why not?
Answer: An electrostatic field line represents the actual path followed by a unit positive charge placed in an electric field. As the charge experiences a continuous force, it never jumps from one position to another. So the field line is a continuous curve and cannot have sudden breaks.
Q: 1.7) (b) Explain why two field lines never cross each other at any point?
Answer: Because if they do, then we can draw two tangents at the point of intersection, which will mean two directions of electric field at that point. This is impossible. So electric field lines can never intersect.
Examples on how to find equivalent capacitance between two points in a given circuit:
Example 1: In the circuit given below, find the equivalent capacitance between points A and B.
Example 4: Find the equivalent capacitance between points A and B in the given figure.