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(p) Electrons with speed v, much less than c, are injected into a uniform magnetic field...

(p) Electrons with speed v, much less than c, are injected into a uniform magnetic field of flux density B at an angle θ to the field. (i) Show the motion is periodic. (ii) Determine the time for one period, T. (iii) Determine the distance travelled, L, along the direction of the field in time T . Hint: Consider the motion along and perpendicular too the field

Please explain along with solutions, as I forgotten some magnetism

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