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Question

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The proton moves through a magnetic field of magnitude 3x10^-5 T with a velocity of 4x10^5 m/s. Find the radius of the circular path the proton follows and indicate its direction of rotation.

Answer 1

http://img34.imageshack.us/img34/1074/physics.tif
(For the benefit of the science teachers around here!)

Be sure you let them know what YOU THINK about this ... how YOU might go about solving it.

Answer 2

set the centripetal force equal to magnetic force, and solve for r.