A) \[\frac{1}{16}m{{s}^{-1}}\]
B) \[\frac{1}{40}m{{s}^{-1}}\]
C) \[\frac{1}{80}m{{s}^{-1}}\]
D) \[\frac{1}{32}m{{s}^{-1}}\]
Correct Answer: C
Solution :
: Here, Current, \[I=2A\] Area of cross-section, \[A=2\times {{10}^{-6}}{{m}^{2}}\] Number density of free electrons, \[n=5\times {{10}^{26}}{{m}^{-3}}\] The drift speed of electrons is \[{{\upsilon }_{d}}=\frac{I}{nAe}\] \[=\frac{2A}{(5\times {{10}^{26}}{{m}^{-3}})(2\times {{10}^{-6}}{{m}^{2}})(1.6\times {{10}^{-19}}C)}\] \[=\frac{1}{80}m{{s}^{-1}}\]
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