Question

A particle of mass m and charge q is lying at the origin in a uniform magnetic field B directed along x-axis. At time t = 0, it is given a velocity v_0, at an angle theta with the y-axis in the xy-plane. Find the coordinates of the particle after one revolution.

Answer 1

Path is helix and after one rotation only x-coordinate will change by a distance equal to pitch.
Therefore answer is A::B;


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