Draw the magnetic field lines of a bar magnet.

Compare the magnetic fields on a bar magnet and a solenoid.

Find the magnetic field due to a short bar magnet at any point on axial line.

Show the behaviour of magnetic field lines near a diamagnetic and paramagnetic substance.

What is magnetic field?

Why magnetic field exist inside a magnet?

Consider a bar magnet of length l and magnetic moment m at a distance r fróm its mid point, where r >>l Show that the magnetic field B due, to this bar is vecB = (mu_ovecm)/(4pir^3)mu_o alog equator.