(a) A bar magnet is placed on a sheet of paper and its boundary is marked with a pencil. A magnetic compass is brought near the N-pole of the bar magnet. It is observed that N-pole of magnet repels the N-pole of compass needle due ot which the tip fo the compass needle moves away from the N-pole.
Thus a magnetic field pattern is obtained around a bar magnet. Each magnetic field line is directed from the north pole of a magnet to its south pole. The field lines are closest together at the two poles of the bar magnet. The strength of magnetic field is indicated by the degree of closeness of the field lines. So the magnetic field is the strongest near the poles.
(b) (i) The direction of magnetic field lines inside a bar magnet is from it south pole to its north pole.
(ii) The direction of magnetic field lines outside a bar magnet is from its north pole to its south pole.
