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How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?

A. 6000 turns

B. 600 turns

C. 167 turns

D. 67turns

You can do it
  1. What is the cgs unit of magnetomotive force?
  2. The force between two magnetic poles varies with the distance between them. The variation is ______…
  3. How many electrons are needed in the valence orbit to give a material's stability?
  4. The magnetic field of a bar magnet most closely resembles the magnetic field of
  5. The electrons in the last orbit of an atom are called _______ electrons.
  6. Small voltages generated by a conductor with current in an external magnetic field.
  7. One of the common application of an air- cored choke.
  8. The straight line passing through the two poles of magnet is called
  9. Which of the following is a paramagnetic material?
  10. Which element has four valence electrons?
  11. The magnetic materials should have a large hysteresis loss for one of the following applications.
  12. The dielectric constant of most materials lies between
  13. Lenz' law states that the direction of the induced emf and hence current
  14. A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
  15. A 200-watt lamp working for 24 hours will consume approximately _____ units.
  16. Which of the following is a vector quantity?
  17. The resistivity of a conductor ___________ with an increase in temperature.
  18. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
  19. What is used as the dielectric material in high voltage transformers?
  20. A germanium atom has an atomic weight of72. How many neutrons are there?
  21. The magnetic field around the conductor is determined by the
  22. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  23. Which of the following materials has the least hysteresis loop area?
  24. One that has magnetic poles produced by internal atomic structure with no external current necessary
  25. Which of the following is a natural magnet?
  26. It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
  27. A good conductor has how many valence electrons?
  28. Which of the following materials has permeability slightly less than that of free space?
  29. One coulomb of charge consists of ________ electrons.
  30. Who discovered superconductivity in 1911?