A) \[1.3\times {{10}^{4}}\Omega \]
B) \[1.7\times {{10}^{5}}\Omega \]
C) \[2.7\times {{10}^{6}}\Omega \]
D) \[3.3\times {{10}^{7}}\Omega \]
Correct Answer: C
Solution :
[c] \[V=200(1-{{e}^{-t/\tau }})\] \[120=200(1-{{e}^{-t/\tau }})\] \[\Rightarrow {{e}^{-t/\tau }}=\frac{200-120}{200}=\frac{80}{200}\] \[\frac{t}{\tau }={{\log }_{e}}2.5\] \[=2.302\times {{\log }_{10}}2.5=2.302\times 0.4=0.9210\] \[5=(0.9210)\times R\times 2\times {{10}^{-6}}\] \[\Rightarrow R=2.7\times {{10}^{6}}\Omega \]You need to login to perform this action.
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