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Network TheoryCoupled Circuits

Two coupled coils have L1=2 H, L2=3 H and M=1 H. If connected in series opposing, their equivalent inductance is?

  • A1 H
  • B3 H
  • C5 H
  • D7 H
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Correct Answer: B. 3 H
Explanation: For series-opposing connection, Leq=L1+L2-2M=2+3-2=3 H.
Reference: Standard network theory: series-opposing coupled coils
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