A) \[1.7\times {{10}^{5}}\Omega \]
B) \[2.7\times {{10}^{6}}\Omega \]
C) \[3.3\times {{10}^{7}}\Omega \]
D) \[1.3\times {{10}^{4}}\,\Omega \]
Correct Answer: B
Solution :
[b] We have, \[V={{V}_{0}}\,(1\,-{{e}^{-t/RC}})\] \[\Rightarrow \,120\,=200(1-{{e}^{-t/RC}})\,\Rightarrow \,t=RC\] in \[(2.5)\,\Rightarrow \,R\] \[=2.71\times {{10}^{6}}\,\Omega \]
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