Introduction to magnetic materials and inductor

          Introduction to magnetic materials

• All materials have inherent magnetic characters formed due to the movement of electrons. 
• Transition metals, lanthanides and their compounds are used as magnetic materials. 
• The properties of magnetic materials are: 

1. Paramagnetism, 
2. Ferromagnetism, 
3. Antiferromagnetism, 
4. Ferrimagnetism. 

                  Introduction to inductor

• *An inductor is a two terminal electric component which resists changes in electric current. 
• *It is a conductor wire wound into coil. 
• *Construction of Inductor 

1. >Inductors are made up of insulating wire like copper wire wound on a plastic or ferromagnetic material. 
2. >The inductor symbol is shown. 
   

• Working :-

1. When current flows through the coil, a magnetic field is set. 
2. This field restricts the flow of current. 
3. Once the field is created then current passed normally through it thus resisting any change in the flow of current. 

• Characteristics:-

1. The resistance of the wire used in winding the coil is assumed negligible. 
2. The amount of induced voltage in a coil is directly proportional to the rate of change of magnetic field of coil. 
3. The induced voltage of the coil is proportional to the number of turns.