A) \[\frac{R}{5}\]
B) \[\frac{R}{4}\]
C) \[\frac{R}{3}\]
D) 4 R
Correct Answer: C
Solution :
\[\frac{i}{{{i}_{g}}}=1+\frac{G}{S}\Rightarrow \frac{4}{1}=1+\frac{R}{S}\]\[\Rightarrow S=\frac{R}{3}\].
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