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.
 20 mH.
  10 mH.
 5 mH.

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Electromagnetic Field Theory
The developed electromagnetic force and or torque in electromechanical energy conversion system act in a direction that tends

 to decrease the stored energy at constant mmf.
 to decrease the stored energy at constant flux.
 to decrease the co-energy at constant mmf.
 to increase the stored energy at constant flux.

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