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Further reading:

Genaral information on “Electromagnetic induction”

A condition for inducing a voltage and thus a current, is the presence of a changing magnetic field!
If the magnet is moved into the coil, the measuring instrument will deflect in one direction. The faster we move the magnet into the coil, the stronger the deflexion will be. If the magnet remains in the coil in peace no current will be induced. The change of the magnetic field and the induced current are directly proportional.
If the magnet is pulled out of the coil, the measuring instrument will show a deflexion again but this time in the opposite direction. Now a voltage with opposite polarity is induced.
It needs to be taken into account also, the more loops the coil has the stronger the induced current will be.

If you require more information, then click on the link below directly to Amazon:

Books: Electromagnetic induction

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