2 The field lines of (a) a bar magnet, (b) a current-carrying finite solenoid and
(c) electric dipole At large distances, the field lines are very similar The curves
labelled  i  and ii are closed Gaussian surfaces Rationalised 2023-24
139
Magnetism and
Matter
The resemblance of magnetic field lines for a bar magnet and a solenoid
suggest that a bar magnet may be thought of as a large number of
circulating currents in analogy with a solenoid