A) \[0.8\,\Omega \]
B) \[0.5\,\Omega \]
C) \[0.4\,\Omega \]
D) \[0.25\,\Omega \]
Correct Answer: D
Solution :
\[\frac{X}{1}=\frac{20}{80}\] Þ \[X=\frac{1}{4}\Omega =0.25\,\Omega \].
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