A) 6 amp
B) 2 amp
C) 3.46 amp
D) 0.66 amp
Correct Answer: C
Solution :
\[\operatorname{Heat} produced by\,\,ac = 3\,\,\times \, Heat produced by dc\] \[\therefore \,\,\,\,\,\,\,{{i}^{2}}_{rms}Rt=3\times {{i}^{2}}RT\,\,\,\,\,\Rightarrow \,\,\,\,{{i}^{2}}_{rms}=3\times {{2}^{2}}\] \[\Rightarrow \,\,\,{{i}_{rms}}=2\sqrt{3}\,\,=\,\,3.46\,\,A\,\]
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