A) \[1.25\times {{10}^{-4}}m{{s}^{-1}}\]
B) \[1.25\times {{10}^{-3}}m{{s}^{-1}}\]
C) \[1.25\times {{10}^{-5}}m{{s}^{-1}}\]
D) \[6.25\times {{10}^{-3}}m{{s}^{-1}}\]
Correct Answer: B
Solution :
Current, \[I=nAe{{v}_{d}}\] \[\therefore \] Drift velocity \[{{v}_{d}}=\frac{I}{nAe}\] \[=\frac{20}{{{10}^{29}}\times {{10}^{-6}}\times 1.6\times {{10}^{-19}}}\] \[{{v}_{d}}=1.25\times {{10}^{-3}}m{{s}^{-1}}\]
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