A) \[\frac{20}{19}\Omega \]
B) \[\frac{19}{20}\Omega \]
C) \[\frac{19}{10}\Omega \]
D) \[\frac{10}{19}\Omega \]
Correct Answer: A
Solution :
\[\frac{1}{{{R}_{eq}}}=\frac{1}{{{R}_{1}}}+\frac{1}{{{R}_{2}}}+\frac{1}{{{R}_{3}}}\]\[=\frac{1}{2}+\frac{1}{4}+\frac{1}{5}\]\[=\frac{19}{20}\]Þ\[{{R}_{eq}}=\frac{20}{19}\,\Omega \]
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