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Electromagnatism (Current and magnetism (A current flowing through a wire…
Electromagnatism
Current and magnetism
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This photo shows a wire passing through a piece of card 
When a current flows through the wire, iron filings on the card make circular patterns.
This shows that the current is causing a magnetic field as the iron fillings are lining up in the direction of the magnetic field.
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The strength of the magnetic field relies on the strength of the current- the higher the current the stronger the magnetic field.
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What are electro magnets
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The magnetic field of an electromagnet can be made stronger by putting a piece of iron inside the coil.
This becomes a temporary magnet- it is only magnetic while the field from the electromagnet is affecting it.
To make an electromagnet you need: A coil, A core and A current
Current, coils and magnetic fields
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If the wire is made into a coil (called a solenoid) the magnetic fields of all the different parts of the wire form an overall magnetic field like the one in this diagram (see page 171 for a better diagram)
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