A) \[2\,\Omega \]
B) \[8\,\Omega \]
C) \[20\,\Omega \]
D) \[40\,\Omega \]
Correct Answer: C
Solution :
By Wheatstone bridge, \[\frac{R}{80}=\frac{AC}{BC}=\frac{20}{80}\] Þ \[R=20\,\Omega \]
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