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NEET 2019 · RL and RC Series Circuits

RL and RC Series Circuits question from NEET 2019

Q48NEET 2019Easy

RL and RC Series Circuits

A circuit when connected to an AC source of 12 V gives a current of 0.2 A. The same circuit when connected to a DC source of 12 V, gives a current of 0.4 A. The circuit is

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Answer: (b)

  1. DC current flows, so there is no capacitor in series (a capacitor blocks DC).
  2. DC: R=120.4=30 ΩR = \frac{12}{0.4} = 30\ \Omega. AC: Z=120.2=60 Ω>RZ = \frac{12}{0.2} = 60\ \Omega > R, so a reactance is present.
  3. The extra opposition only on AC comes from an inductor.
  4. So the answer is (b) Series LR.
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