Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 magnetic flux lines are always closed.
 it is solenoidal.
 it has no sink or sources.
 it is conservative.

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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

At frequencies below the cut off value the wave progresses across the waveguide after total reflections
Waveguides can handle large power at UHF and microwaves
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
At waveguide can be coupled to a coaxial cable

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

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