How do you trace the magnetic field lines around a bar magnet using compass needle ? Explain. Write the properties of magnetic field Lines.

Explanation

(a) Place the bar magnet on a sheet of white paper fixed on a drawing board. Mark the boundary of the magnet.
(b) Place the magnetic compass near the north pole of the given magnet.
(c) Mark the position of two ends of the needle. Now move the needle to a new position such that its south pole occupies the position previously occupied by its north pole .
(d) In this way proceed step by step till you reach the south pole of the given magnet.
(e) Join the points marked on the paper by a smooth curve. This curve represents a field line. Repeal the above steps for new positions of compass needle.

Properties of magentic filed lines. :
(i) Two magnetic field lines never intersect each other.
(ii) Outside the magnet, the magnetic field lines are directed from North pole of magnet towards South pole.
(iii) The magnetic field lines at any one point gives the direction of magnetic field at that point.