How is Current Induced in a Coil of Wire?
When a magnet is moved towards (or inside) a coil of wire,
a current is induced inside the
wire.
This can be shown by connecting the coil
to a very
sensitive ammeter called a galvanometer.
The size of the induced current can be made bigger by
1. Using a stronger magnet.
2. Moving the magnet at a faster speed.
3. Using more turns of wire on the coil.
These all result in the pointer on
the galvanometer
moving further to the right.
The direction of the current can be reversed by
1. Moving the magnet in the opposite direction.
2. Using a magnet facing the
opposite way round
(with North becoming South).
These both result in the pointer on
the galvanometer
moving to the left.
If the magnet stops moving, even though it may
still be
inside the coil of wire,
no current
is induced in the wire.
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