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11. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is ________.
(a) Z = 150
(b) Z = 150 ∠90° Ω
(c) Z = 150 ∠–90° Ω
(d) Z = 150 ∠180° Ω
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