9. Electrons (mass m, charge –e) are accelerated from rest through a potential difference V and are then deflected by a perpendicular magnetic field B. The radius of the resulting electron trajectory is:
(A) (√2eV/m)/B
(B) B√2eVm
(C) (√2mV/e)/B
(D) B√2mV/e
(E) none of these

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