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7. A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
(a) 37.9 Ω
(b) 3.7 Ω
(c) 14,400 Ω
(d) 4,800 Ω
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