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NEET 2011 (AIPMT, Mains) · RL and RC Series Circuits

RL and RC Series Circuits question from NEET 2011 (AIPMT, Mains)

Q54NEET 2011 · AIPMT · MAINSMedium

RL and RC Series Circuits

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be

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Answer: (b)

  1. XL∝fX_L \propto f: at 100 Hz, XL=2×20=40 ΩX_L = 2 \times 20 = 40\ \Omega.
  2. Z=302+402=50 ΩZ = \sqrt{30^2 + 40^2} = 50\ \Omega
  3. I=VZ=20050=4 AI = \frac{V}{Z} = \frac{200}{50} = 4\text{ A}
  4. So the answer is (b) 4.0 A.
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