Particular GeometriesThe magnetic field produced by a long straight wire is
and r is the distance away from the long straight wire.
The direction of the magnetic field is given by the Right Hand Rule.
A magnetic field is produce by a circular current loop,
The magnetic field at the center of a circular current loop is
where a is the radius of the circular loop.
At a distance x from the loop, on a perpendicular line passing through the center of the loop, the magnetic field is
R is the radius of the circular loop.
The magnetic field inside a solenoid is
where n is the number of turns per length.
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(c) Doug Davis, 2002; all rights reserved