" A 6.0-mH inductor is in a series ci RC uit with a resistor and an ideal battery. At the instant the current in the ci RC uit is 5.0A the energy stored in the inductor is: "
"A. 0 B. 7.5×10−2J C. 15×10−2J D. 30×10−2J E. unknown since the rate of change of the current is not given"
"The angular frequency of a certainR LC series ci RC uit isω0. A sou RC e of sinusoidal emf, with angular frequencyω, is inserted into the ci RC uit and ωis varied while the amplitude of the sou RC e is held constant. For which of the following values ofωis the amplitude of the current oscillations the greatest? "
"A. ω0/5 B. ω0/2 C. ω0 D. 2ω0 E. None of them (they all produce the same current amplitude)"
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