RL Circuits – 14

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14. A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is ________.

(a) 5.51 Ω
(b) 55.15 Ω
(c) 90 Ω
(d) 200 Ω

Answer
Answer : (b)
Explanation
Explanation :

Z = (R * XL) / √ (R2 + XL2)
Z = 140 * 60 / √(140 * 140 + 60 * 60)
= 8400 / 152.315 = 55.15 Ω

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