Question

What are magnetic field lines? How is the direction of the magnetic field at a point determined?​

Answer 1

A magnetic field is represented by a series of lines around a magnet. The path along which north pole moves in a magnetic field is called magnetic lines of force or magnetic field line.

    The direction of the magnetic field at a point can be found by placing a small magnetic compass at that point. The north end of the needle of  a compass indicates the direction of magnetic field at a point where it is placed.

Answer 2

Answer:

A magnetic field line is the path along which a free north pole tends to move.The direction of a magnetic field at a point is determined by placing a small compass needle.the north pole of compass indicates the direction of magnetic field at that point.

Explanation:

The properties of magnetic field lines are as follows:

1.magnetic field lines emerge from the north pole and merge at the South pole.

2.The strength of the magnetic field is shown by the degree of closeness of the field lines.

3.The field is stronger where the field lines are crowded.

4.magnetic lines do not intersect with each other..

Hope this answer is helpful..