A) \[{{v}_{d}}\propto E\]
B) \[{{v}_{d}}\propto \frac{1}{E}\]
C) \[{{v}_{d}}=\text{constant}\]
D) \[{{v}_{d}}\propto {{E}^{2}}\]
Correct Answer: A
Solution :
\[{{v}_{d}}=\frac{e}{m}\times \frac{V}{l}\tau \] or \[{{v}_{d}}=\frac{e}{m}.\frac{El}{l}\tau \] (Since \[V=El)\] \[\therefore {{v}_{d}}\propto E\]
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