A) \[{{\text{v}}_{\text{d}}}\propto E\]
B) \[{{\text{v}}_{\text{d}}}\propto \frac{1}{E}\]
C) \[{{\text{v}}_{\text{d}}}\text{=constant}\]
D) \[{{\text{v}}_{\text{d}}}\propto {{E}^{2}}\]
Correct Answer: A
Solution :
(a) \[{{\text{v}}_{\text{d}}}\propto E\]
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