A) 4 : 1
B) 1 : 1
C) 1 : 2
D) 1 : 4
Correct Answer: D
Solution :
Drift velocity \[{{v}_{d}}=\frac{I}{nAe}=\frac{I\times 4}{n\pi {{D}^{2}}e}\] ie, \[{{v}_{d}}\propto \frac{1}{{{D}^{2}}}\] \[\frac{{{v}_{{{d}_{1}}}}}{{{v}_{{{d}_{2}}}}}=\frac{D_{2}^{2}}{D_{1}^{2}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\]You need to login to perform this action.
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