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: Option B
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Related Questions on RL Circuits
If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
A. Doubles
B. Halves
C. Remains constant
D. Cannot be determined without values
When the frequency is decreased, the impedance of a parallel RL circuit
A. Increases
B. Decreases
C. Remains constant
D. Is not a factor
Z= 140×60/152.31
=55.15 ohm, where 152.31= under root 140×140+60×60