A) \[0.5\,\Omega \]
B) \[0.6\,\Omega \]
C) \[1.2\,\Omega \]
D) \[1.5\,\Omega \]
Correct Answer: C
Solution :
\[r=\frac{({{l}_{1}}-{{l}_{2}})}{{{l}_{2}}}\times R'=\left( \frac{60-50}{50} \right)\times 6=1.2\,\Omega \]
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