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ELECTROMAGNETIC FIELD THEORY

Electromagnetic Field Theory
The shape of B-H curve for air gap is

 parabola.
 straight line.
 ellipse.
 hyperbola.

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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?

  10 mH.
 0 mH.
 5 mH.
 20 mH.

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Electromagnetic Field Theory
Conductor is constant and field is varying then emf will be induced. This principle is called

 virtually induced emf.
None of these
 dynamically induced emf.
 static induced emf.

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Electromagnetic Field Theory
Conductor is varying and field is fixed then emf will be induced. This principle is called

 both A and B.
 dynamically induced emf.
 static induced emf.
None of these

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Electromagnetic Field Theory
For a linear electromagnetic circuit, which of the following statement is true?

 Field energy is greater than the co-energy.
 Co-energy is zero.
 Field energy is equal to the co-energy.
 Field energy is lesser than the co-energy.

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