Question: An alpha particle ( 4 He nucleus with twice the elementary charge e and roughly four times the mass of the proton mp ) enters

An alpha particle (4He nucleus with twice the elementary charge e and roughly
four times the mass of the proton mp) enters a region of uniform magnetic field of
strength B. Its velocity is perpendicular to both magnetic field lines and the border of
the region. Upon leaving the region, the particle is deflected from its original direction
of motion by a small angle '. If the size of the magnetic field region is L, what is the
speed of the alpha particle? 

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