Electromagnetic Field Theory
The coils having self inductance of 10 mH and 15 mH have an effective inductance of 40 mH, when connected in series aiding. What will be the equivalent inductance if we connect then in series opposing?

 0 mH.
 5 mH.
 20 mH.
  10 mH.

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Electromagnetic Field Theory
Which of following is true for a purely inductive circuit ?

 Apparent power of the circuit is zero.
 Any capacitance even if present in the circuit will not be charged.
 Actual power of the circuit is zero.
 Reactive power of the circuit is zero.

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