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Network TheoryCoupled Circuits

If the dot convention shows current entering the dotted terminal of coil 1 and the mutually induced voltage of coil 2 is referenced positive at its dotted terminal, the mutual-voltage term is taken as?

  • A+M di1/dt
  • B-M di1/dt
  • CZero for all coupling
  • DM/i1
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Correct Answer: A. +M di1/dt
Explanation: With the stated dot-reference convention, current entering a dotted terminal induces a voltage positive at the dotted terminal of the other coil, giving a positive mutual term.
Reference: Standard network theory: dot convention
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