A) 0.4 m/s
B) 16 m/s
C) Zero
D) 0.1 m/s
Correct Answer: D
Solution :
Current density of drifting electrons j = nev \[n=5\times {{10}^{7}}c{{m}^{-3}}=5\times {{10}^{7}}\times {{10}^{6}}{{m}^{-3}}\]. \[v=0.4m{{s}^{-1}},\,e=1.6\times {{10}^{-19}}C\]Þ \[j=3.2\times {{10}^{-6}}A{{m}^{-2}}\] Current density of ions = (4 ? 3.2) ´ 10?6 =\[0.8\times {{10}^{-6}}\frac{A}{{{m}^{2}}}\] This gives v for ions = 0.1 ms?1.
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