Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 uz N.
 5 × 10-5 ux N.
  - 5 × 10-5 uy N.
 5 × 10-5 uy N.

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

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