Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Vertical grounded wire type
Any of the above
Parabolic reflector type
Horizontal suspended wire type

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

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