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Home › Network Theory › Two magnetically coupled coils have L1=4 H, L2=9 H, and coupling coefficient k=0.5. Their mutual inductance M is?
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Network TheoryCoupled Circuits

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

  • A1.5 H
  • B3 H
  • C6 H
  • D18 H
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Correct Answer: B. 3 H
Explanation: M=k sqrt(L1L2)=0.5×sqrt(4×9)=0.5×6=3 H.
Reference: Standard network theory: mutual inductance numerical
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