Inductance

Explanation of question 9

Two coils, each of an inductance of 4mH, are connected in series. Their combined inductance

  1. is 12mH
  2. is 8mH
  3. is 2mH
  4. could be either 2mH, 8mH or 12mH

The answer is :- 4  It cannot be assumed that there is no mutual inductance. The combined inductance is not necessarily 8mH.

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