A) \[1\,\Omega \]
B) \[0.5\,\Omega \]
C) \[1.2\,\Omega \]
D) \[2.5\,\Omega \]
Correct Answer: B
Solution :
(b) \[0.5\,\Omega \] \[r=R\left( \frac{{{l}_{1}}-{{l}_{2}}}{{{l}_{2}}} \right)=2\times \left( \frac{50-40}{40} \right)=0.5\,\Omega \]
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