A) the electron drift speed is usually very large
B) the number density of free electrons is very high and this can compensate for the low values of the electrons drift speed and the very small magnitude of the electron charge
C) the number density of free electrons as well as the electron drift speeds are very large and these compensate for the very small magnitude of the electron charge
D) the very small magnitude of the electron charge has to be divided by the still smaller product of the number density and drift speed of get the electric current.
Correct Answer: B
Solution :
\[I=ne\,A\,{{v}_{d}}\] \[{{v}_{d}}\]is of order of few \[m{{s}^{-1}}\], \[e=1.6\times {{10}^{-19}}C\] A is the order of\[m{{m}^{2}}\], so a large I is due to a large value of n is conductors.
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