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Electromagnetic TheoryMutual Inductance

For two coupled coils with self-inductances L1 and L2 and coupling coefficient k, the mutual inductance magnitude is?

  • AM = k sqrt(L1 L2)
  • BM = k(L1+L2)
  • CM = L1L2/k
  • DM = k/(L1L2)
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Correct Answer: A. M = k sqrt(L1 L2)
Explanation: The coupling coefficient is defined by k=M/sqrt(L1L2), hence M=k sqrt(L1L2).
Reference: Standard electromagnetic theory: mutual inductance
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