Frequently Asked Questions
When is the magnetic force on a charge zero?
The magnetic force is zero when the charge is at rest, when the magnetic field is zero, or when the velocity is exactly parallel to the field so the angle is zero degrees and its sine is zero.
Does the magnetic force change a particle speed?
No. Because the magnetic force always acts at a right angle to the motion, it changes direction but does no work, so the particle speed stays constant while its path curves.
What units should I use?
Use coulombs for charge, meters per second for velocity, and tesla for the magnetic field. The result then comes out in newtons.
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