Magnetic Sources

Particular Geometries

The 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.

Biot-Savart Law

Forces between Conductors

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(c) Doug Davis, 2002; all rights reserved