A) \[2.5\times {{10}^{-3}}\]
B) \[2.5\times {{10}^{-2}}\]
C) \[5\times {{10}^{2}}\]
D) \[5\times {{10}^{-3}}\]
E) \[5\times {{10}^{-2}}\]
Correct Answer: D
Solution :
Drift velocity = mobility x intensity of electric field or \[{{v}_{d}}=\mu E\]or\[\mu =\frac{{{v}_{d}}}{E}\] or \[\mu =\frac{{{v}_{d}}}{V/l}\] \[\left( \because E=\frac{V}{l} \right)\] \[\therefore \] \[\mu =\frac{0.5\times 2}{220}=4.5\times {{10}^{-3}}\] \[\approx 5\times {{10}^{-3}}{{m}^{2}}{{V}^{-1}}{{s}^{-1}}\]
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