An electromagnet is a soft iron core in a current carrying solenoid. The magnetic field of the coil induces magnetism in the soft iron which produces a powerful magnet with a strong magnetic field.
An electromagnet can be made by winding coils of wire on a soft iron in opposite directions round the two arms S and T of u shape soft iron bar.
When current flows round the solenoid, a strong magnetic field is produced.
The strength of an electromagnet depends on
- The size of the current
- Increase in number of turns of wire in the coil
- A high permeability core
Uses of Electromagnet
- The magnetic field produced are used in electric motors and generators
- They are used in lifting heavy materials instead of cranes
- They are used in electric bells, telephone earpiece
- They are used in separating magnetic substances from non-magnetic substances
- They are used in hospitals to remove splinter of iron or steel from the eye