Question

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

Answer 1

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 N - pole of compass indicates the direction of magnetic field at that point.

Answer 2

Answer:

The lines are directed from north pole to the south pole outside the magnet while they are directed from south pole to north pole inside the magnet. A tangent drawn on a magnetic field line gives the direction of the magnetic field at that point. The direction can also be determined by using a magnetic compass.