Magnetism and Matter

A curve between magnetic moment and temperature of magnet is :
The magnetic field lines due to a bar magnet are correctly shown in
Kinematics of electric bell can be considered to have single degree of freedom.
In an experiment it is found that the magnetic susceptibility of given substance is much more greater than one. The possible substance is?
Magnetic induction on the axial line due to a short bar magnet is _____________ .