SS3: PHYSICS - 2ND TERM
Magnetic Field | Week 14 Topics
Electromagnetic Field4 Topics
Electromagnetic Induction6 Topics
The Transformer5 Topics
Simple A.C Circuit4 Topics
Models of the Atom2 Topics
Half Life8 Topics
Energy Quantization3 Topics
Photoelectric Effect4 Topics
Wave Particle Paradox3 Topics
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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