A) \[5\,\Omega \]
B) \[10\,\Omega \]
C) \[15\,\Omega \]
D) \[20\,\Omega \]
Correct Answer: D
Solution :
\[{{V}_{AB}}=4=\frac{5X+2\times 10}{X+10}\] Þ \[X=20\Omega \]
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