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Solenoids for SQA National 5 Physics
This page covers the following topics:
1. How a solenoid works
2. Use of iron core and other materials
3. Solenoids, magnetic fields, direction
A solenoid is shown in the diagram
A solenoid electromagnet is made by wrapping insulated wire around an iron core.
An electromagnet is a solenoid with an iron core. The force between an electromagnet or magnet and a magnetic material is always one of attraction.
1
Electromagnets are commonly used in devices called relays. What is a relay?
Relay is an electrically operated switch.
2
What is the name given to a solenoid with an iron core?
electromagnet
3
Complete the sentence: a solenoid consists of a .... coiled up in a spiral shape.
wire
4
Why is an electromagnet made from iron not steel?
Iron can be magnetised and demagnetised much easier than steel can be.
5
Are solenoids temporary or permanent magnets?
temporary
End of page