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When a current flows through a
conductor,
it produces a magnetic
field.
The shape of the magnetic
field depends on the shape of
the conductor.
You need to know the shape of the
magnetic field
for a straight wire (shown below) and a coil.
The magnetic
field around a straight
wire is circular,
at right angles to the wire.
You can work out the direction of the field using your right
clenched fist.
Point your thumb upwards in the same
direction as the current.
The direction of the field is the same
direction in which your fingers
curl.
Reversing the direction of the current
will reverse the magnetic field direction.
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Copyright © 2008 Dr. Colin France. All Rights Reserved.