A proton moves in a circular orbit with a radius of 65 cm that is perpendicular to a uniform magnetic field of magnitude 0.75 T. What is the orbital period for the motion? What is the speed of the proton? What is the kinetic energy of the proton?

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First, apply Newton’s second law to the orbiting proton to relate its speed to its radius. After, use the definition of its period (T) to eliminate r and calculate a value for T. Then find the relationship between it's period and velocity to determine v. Lastly, once the speed is known, use the definition of kinetic energy.

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