A) \[0.25\,\Omega \]
B) \[0.50\Omega \]
C) \[0.80\,\Omega \]
D) \[1.00\,\Omega \]
Correct Answer: B
Solution :
\[r=\left( \frac{{{l}_{1}}-{{l}_{2}}}{{{l}_{1}}} \right)R=0.5\,\Omega \].
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