A long, closely wound solenoid is connected to a constant current source.
a. (a) Draw a neat diagram of the magnetic field lines associated with the solenoid, clearly showing the region inside and outside the coil.
b. (b) Explain why the magnetic field inside a sufficiently long solenoid is considered nearly uniform, whereas the field outside is weak and non-uniform.
c. (c) How does the magnetic field pattern of this solenoid compare with that of a bar magnet? State any two similarities and one difference.