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Solve the following question given below:

Question: What is the radius of the smallest possible circular orbit that a proton with the kinetic energy equal to 3.9MeV can have in a 1 T magnetic field? The mass of a proton is 1.67 x 10-27 kg and its charge is 1.609 x 10-19.

Please show all work and steps to determine the radius of the smallest possible circular orbit.

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