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21. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
(a) 219 kΩ
(b) 66 kΩ
(c) 660 kΩ
(d) 1.3 MΩ
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