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Electromagnetism - Coggle Diagram
Electromagnetism
How it works in a wire
If you had an electric current flowing from one end of a wire to another end of the wire it would create a magnetic field around the wire.
The magnetic field would have field lines in concentric circles around the wire and they would be closest together near the wire.
The direction of the magnetic field depends on the direction of the current and we work this out using the right hand rule.
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Soleniod
This is a cylindrical coil of wire that acts as a magnet when an electrical current flows through it.
The magnetic field within a solenoid is strong an uniform, while the magnetic fields on the outside are the same as would be found in a bar magnet.
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Electromagnets
These are useful as they are only magnetic while their is a current flowing through the wire. So when we turn off the power source the magnetic field disappears.
We can also reverse the direction of the magnetic field, by changing the direction of the current.
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Motor effect
When a wire with a current flowing through it is placed in a magnetic field, the magnet and conductor experience a force. This is the motor effect.
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