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Network TheoryCoupled Circuits

For two coupled inductors connected in series aiding, the equivalent inductance is?

  • AL1+L2-2M
  • BL1+L2+2M
  • CL1L2/M
  • DM-L1-L2
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Correct Answer: B. L1+L2+2M
Explanation: With series-aiding polarity, mutual flux reinforces self flux, giving Leq=L1+L2+2M.
Reference: Standard network theory: series-aiding coupled coils
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