A) \[1.2\,\Omega \]
B) \[1.4\,\Omega \]
C) \[0.12\,\Omega \]
D) \[0.14\,\Omega \]
Correct Answer: C
Solution :
\[H=\frac{{{V}^{2}}t}{4.2\,R}\] or \[\frac{H}{t}=\frac{{{V}^{2}}}{4.2\,R}\] Þ \[800=\frac{20\times 20}{4.2\times R}\]Þ \[R=\frac{5}{42}=0.119\approx 0.12\,\Omega \]
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