Two electric lines never cross each other. Why?

Explain why the two field lines never cross each other at any point?

An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not? Explain why two field lines never cross each other at any point?

To hear beats,it is essential to have two frequencies very close to each other.Why?

Fill ups Two magnetic lines………………cross each other.

No two equipotential intersect each other. Why?

What do you mean by magnetic lines of force? Why two such lines do not cross each other?