( 1 ) The magnetic field lines in a bar magnet or a solenoid form closed loops from north pole to south pole outside the magnet or solenoid and from south pole to north pole inside it. Electric field lines are not closed loops. They start from the positive charge and end on the negative charge in an electric dipole.
( 2 ) Tangent to a field line at a point indicates the direction of the field at that point.
( 3 ) The magnitude of field in a region is represented by the number of field lines per unit area in that region.
( 4 ) Field lines do not intersect one another.
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