Phase Angles: A series ac circuit has a resistance of 2.0 k?, a capacitance of 8.0 ?F, and an inductance of 9.0 H. If the frequency of the alternating current is 4.0/? kHz, by what angle does the voltage lead the current?
A. +1.5 rad
B. -1.8 rad
C. +36 rad
D. +3.1 rad
E. -3.1 rad
Answer: A
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