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Electricity and Magnetism

The Motion of Charged Particles in Magnetic Fields

A charged particle moving parallel to the flux lines does not experience a force.

A charged particle moving so as to cross magnetic flux lines experiences a force which acts at 90 to both the flux and the direction of motion.

The magnitude of the force is given by F = qvB sin OMEGABSM (where OMEGABSM is the angle between the field and the direction of motion).

There are three possible paths followed by a charged particle moving through a uniform magnetic field:

1. if OMEGABSM = zero the path is a straight line
2. if OMEGABSM = 90 the path is circular

3. if 0 < OMEGABSM < 90 the path is a helix.


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