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At a particular instant, a proton is traveling horizontally with a velocity of 694 km/s directed...

At a particular instant, a proton is traveling horizontally with a velocity of 694 km/s directed to the east through a region of uniform magnetic field that is directed vertically upward and has a magnitude of 75.8 mT. What is the radius of the circular path along which the proton is traveling? Give you answer in centimeters. [Assume that this experiment takes place in deep space so that the effect of gravity is negligible.]

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