What are magnetic field lines? Justify the following statements.
(i) Two magnetic field lines never intersect each other.
(ii) Magnetic field lines are closed curves.
The imaginary lines representing magnetic field around a magnet are known as magnetic field lines.
(i) Any point on magnetic field line indicates the direction of force on a North pole kept there. If two lines meet, it means that force is acting in two directions at that point which is not possible.
(ii) The direction of field lines outside a magnet is from north pole to south pole while it is from south to north pole inside the magnet and thus forms closed curves.