A) \[\frac{{{v}_{d}}}{8}\]
B) \[\frac{{{v}_{d}}}{4}\]
C) \[\frac{{{v}_{d}}}{2}\]
D) \[{{v}_{d}}\]
Correct Answer: C
Solution :
\[i=neA{{v}_{d}}\] \[{{v}_{d}}=\frac{i}{neA}\]where,\[{{v}_{d}}\]is the drift velociy-of the electron \[\frac{{{v}_{{{d}_{1}}}}}{{{v}_{{{d}_{2}}}}}=\frac{{{i}_{1}}}{{{i}_{2}}}\times \frac{r_{2}^{2}}{r_{1}^{2}}\] \[=\frac{i}{2i}\times \frac{2{{n}^{2}}}{{{n}^{2}}}=2\] \[{{v}_{{{d}_{2}}}}=\frac{{{v}_{{{d}_{1}}}}}{2}=\frac{{{v}_{d}}}{2}\]
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