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The red particle has an electric charge, which you may
set with the Charge slider bar.
As long as it sits motionless, it feels no force.
But if you click on the Fire! button,
the particle will shoot to the right;
and as soon as it moves, the magnetic field
exerts a force upon it.
The direction and magnitude of this force depend upon
the cross product of its velocity and the
magnetic field.
We show you these vectors as little arrows attached
to the particle:
the blue one shows the magnetic field direction and strength,
the red one the particle's current velocity,
and the green arrow the magnetic force on the particle.
Go ahead and click the Fire! button to see what happens.
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