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 Cutting a bar magnet in
half is like cutting a solenoid We get two smaller solenoids with weaker
magnetic properties