A) \[5.5\,\,\Omega \]
B) \[3.5\,\,\Omega \]
C) \[4.5\,\,\Omega \]
D) \[2.5\,\,\Omega \]
Correct Answer: C
Solution :
\[\frac{100}{R+r}=\frac{90}{R}\] \[\Rightarrow \] \[\frac{R+r}{R}=\frac{10}{9}\] \[\Rightarrow \] \[1+\frac{0.5}{R}=\frac{10}{9}\] \[\Rightarrow \] \[\frac{0.5}{R}=\frac{1}{9}\] \[\therefore \]\[R=4.5\,\Omega \]You need to login to perform this action.
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