Drift velocity in a metallic conductor:
At room temperature there are large number of free electrons having zero average velocity, but when electric field is applied, the free electrons start moving in a direction opposite to the direction of the applied field with a velocity called drift velocity.
Magnitude of acceleration produced in each electron by the electric field is

Options

A. `E/(em_e)`
B. `e/(Em_e)`
C. `eEm_e`
D. `(eE)/(m_e)`