Posted by **Anonymous** on Saturday, February 5, 2011 at 5:18pm.

A charge of -8.9 µC is traveling at a speed of 7.8 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 60°. A force of magnitude 4.0 10-3 N acts on the charge. What is the magnitude of the magnetic field?

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