A) \[6\Omega \]
B) \[4\Omega \]
C) \[2.9\,\Omega \]
D) \[3.1\Omega \]
Correct Answer: C
Solution :
\[\eta =\frac{e}{E}\times 100\Rightarrow e=0.3\ E\] Now, \[i=\frac{E-e}{R}\Rightarrow 12=\frac{50-(0.3\times 50)}{R}\Rightarrow R=2.9\Omega \]
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