A proton enters a uniform magnetic field that is
Chapter 20, Problem 9MCQ(choose chapter or problem)
A proton enters a uniform magnetic field that is perpendicular to the proton’s velocity (Fig. 20–51). What happens to the kinetic energy of the proton?
() It increases.
(b) It decreases.
(c) It stays the same.
(d) It depends on the velocity direction.
(e) It depends on the B field direction.
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