Which of the following is correct regarding drift velocity.A. When there is an electric field inside a conductor, the electrons drift slowly opposite to field with constant velocity. `v = (e tau)/(m) E = kE` `tau` : relaxtion time (average time taken by electrons in successive collision with atoms of material) depends on temperature `k` : depends on material of conductor and its temperature.B. The drift velocity is very small `(~= 10^-4 m//sec)` as compared to thermal speed of electrons at room temperature `(~= 10^6 m//sec)`C. Drift velocity depends on the nature of metal, i.e., relaxation time `tau`. With rise in temperature relaxation time and hence drift velocity will decreaseD. All options are correct

Which of the following is correct regarding drift velocity.A. When the

1.	Which of the following is correct regarding drift velocity.A. When there is an electric field inside a conductor, the electrons drift slowly opposite to field with constant velocity. `v = (e tau)/(m) E = kE` `tau` : relaxtion time (average time taken by electrons in successive collision with atoms of material) depends on temperature `k` : depends on material of conductor and its temperature.B. The drift velocity is very small `(~= 10^-4 m//sec)` as compared to thermal speed of electrons at room temperature `(~= 10^6 m//sec)`C. Drift velocity depends on the nature of metal, i.e., relaxation time `tau`. With rise in temperature relaxation time and hence drift velocity will decreaseD. All options are correct
Answer» Correct Answer - D

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