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 (where 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 = zero the path is a straight line
2.	if = 90° the path is circular
3.	if 0 < < 90° the path is a helix.

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