question_answer

For which of the following dependence of drift velocity \[{{v}_{d}}\]on electric field E, is Ohm's law obeyed?

A)  \[{{v}_{d}}\propto {{E}^{2}}\]                      

B)  \[{{v}_{d}}={{E}^{1/2}}\]

C)  \[{{v}_{d}}\]= constant           

D)  \[{{v}_{d}}=E\]