Electromagnetic Induction





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  • Created on: 26-12-10 17:01
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Electromagnetic Induction
As soon as Oersted discovered that electricity produced magnetism, many people
began to look for the reverse effect. Eventually, in 1831, Michael Faraday discovered
hot to make electricity using magnetism. We call this inducted current. Faraday found
that if a wire is moved to cut across lines of flux, then a current is induced in the wire.
This is called electromagnetic induction.
The electrons in the wire have been given a push as the wire moves across the
magnetic field. If the wire moves along the magnetic field lines, there is no current. It has
to cut across the field.
The current can be increased by:
Using a stronger magnetic field,
Moving the wire faster.
If the wire stops moving there is no current.
To remember the direction of the induction current, we use Fleming's Right hand Rule:
Faraday's law: he found that the induced voltage can be increased by:
Using stronger magnet,
Moving the magnet faster,
Increasing the number of turns on the coil.
The direction of the current in the coil can be found by Lenz's Law:
The direction of the inducted current is such that is opposes the change
producing it.


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