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) \( \frac{\sqrt{2eV/m}}{B} \)
(B) \( \frac{B\sqrt{2eVm}}{e} \)
(C) \( \frac{\sqrt{2mV/e}}{B} \)
(D) \( \frac{B\sqrt{2mV}}{e} \)
(E) none of these

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