Question

Discuss the special properties of ferromagnetic materials.

Answer 1

1. When ferromagnetic materials are placed in an external uniform magnetic field, they get strongly magnetized in the direction of the external magnetic field.
   
2. When these materials are placed in an external non-uniform magnetic field, they tend to move from the weaker part to the stronger part of the field.
   
3. All the atoms of the ferromagnetic materials have a resultant magnetic dipole moment even in the absence of any external magnetic field.
   
4. When a thin rod of ferromagnetic substance is placed in an external uniform magnetic field, it comes to rest with its axis parallel to magnetic field.
   
5. Their magnetic susceptibility is positive and very high.
   
6. Ferromagnetic substances remain magnetised even after the removal of the magnetizing field.
   
7. If a watch glass containing a small quantity of a ferromagnetic liquid is placed in between two opposite magnetic poles, the liquid shows and elevation in the middle.
   
8. if such a material is filled in a UTube and if one end of this tube is placed in a magnetic field, the level rises in that end.
   
9. When a ferromagnetic gas is introduced in between the pole pieces of a magnet, it spreads in the direction of the field.