P11. Magnetism
Properties of Magnets
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In the diagram, note that:
- the field lines have arrows on them
- the field lines come out of N and go into S
- the field lines are more concentrated at the poles.
ElectromagnetsWhen an electric current flows in a wire it creates a magnetic field around the wire. By winding the wire into a coil we can strengthen the magnetic field. Electromagnets are made from coils like this.
Making an electromagnet stronger
We can make an electromagnet stronger by doing these things:
Making an electromagnet stronger
We can make an electromagnet stronger by doing these things:
- wrapping the coil around an iron core
- adding more turns to the coil
- increasing the current flowing through the coil.
How can a current produce a magnetic field lab.pdf | |
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Induced Magnetism
By moving a magnet inside a solenoid, the same effect is achieved (field and wire still intersect perpendicularly).
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