A) \[51\times {{10}^{-17}}\,gm/C\]
B) \[28\times {{10}^{-6}}\,gm/C\]
C) \[32\times {{10}^{-5}}\,gm/C\]
D) \[47\times {{10}^{-5}}\,gm/C\]
Correct Answer: D
Solution :
\[m=Zi\,t\] Þ \[Z=\frac{m}{i\,t}=\frac{4.5}{4\times 40\times 60}=47\times {{10}^{-5}}\,g/C\]
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