A) 1 W
B) 3 W
C) 10 W
D) 5 W
Correct Answer: A
Solution :
\[r=\left( \frac{{{l}_{1}}-{{l}_{2}}}{{{l}_{2}}} \right)\times R'\]\[\Rightarrow r=\left( \frac{55-50}{50} \right)\times 10=1\Omega \].
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