A 10nC, 1µg particle is fired into a magnetic field as shown.  Distances are in millimeters, time is in seconds. What is the strength of the field?  Start

2.

A positve particle is fired into containing both an electric and a magnetic field. The black vector represents the velocity and the blue vector represents the force.   You can set the velocity of the test particle if you pause the animation and control-click-drag on the test particle.  How must the fields be arranged in order to obtain the observed behavior?  Start