Question

what is magnetic field line ? give any two properties of magnetic field lines​

Answer 1

Magnetic lines of force have a number of important properties, which include: They seek the path of least resistance between opposite magnetic poles. In a single bar magnet as shown to the right, they attempt to form closed loops from pole to pole. They never cross one another.

Answer 2

magnetic field lines are imagery line used to represent magnetic field 

Properties are as follows:

1.they do not intersect each other 

2.the relative strength of magnetic field lines is given by the degree of closeness

3.their direction is indicated by arrows in the line at any point

4.the direction of field line inside the magnet is from south to north pole and vice-versa outside the magnet