A proton with kinetic energy E=1.6•10-13 J flew into a constant, uniform magnetic field perpendicular to its lines of force, field induction B=1 T. What must be the minimum extent of the magnetic field in order for the direction of motion of the proton to change to the opposite? The mass and charge of the proton are equal, respectively: m=1.7•10-27 kg, e=1.6•10-19 C.
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