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Electromagnetic TheoryMutual Inductance

Two coils have L1=4 H, L2=9 H and coupling coefficient k=0.5. Their mutual inductance is?

  • A1 H
  • B2 H
  • C3 H
  • D6 H
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Correct Answer: C. 3 H
Explanation: M=k sqrt(L1L2)=0.5×sqrt(36)=3 H.
Reference: Standard electromagnetic theory: mutual inductance
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