What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of 2 amperes in the same resistor
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a
6 amp
b
2 amp
c
3.46 amp
d
0.66 amp
answer is C.
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Detailed Solution
Heat produced by ac = 3 × Heat produced by dc∴irms2Rt=3×i2Rt⇒lrms2=3×22⇒irms=23=3.46 A