A permanent magnet does not exert a force on

A. an unmagnetized iron bar

B. a magnetized iron bar

C. a moving electric charge

D. a stationary electric charge

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  1. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  2. A one cubic cm of copper has how many free electrons at room temperature?
  3. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing…
  4. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  5. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  6. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  7. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  8. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
  9. A good conductor has how many valence electrons?
  10. What is the measure of the density and sign of the electric charge at a point relative to that at some…
  11. When the relative permeability of a material is much greater than 1a it is called _______ material.
  12. When the relative permeability of a material is slightly less than 1a it is called _____ material.
  13. Which of the following is a paramagnetic material?
  14. Electric field intensity at a point due to a given charge ______ if the relative permittivity of the…
  15. The magnetic energy stored in an inductor is ______ current.
  16. ______ is an electromagnet with its core in the form of a close magnetic ring.
  17. Under ordinary conditionsa a body is considered
  18. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
  19. Flux density is measured in
  20. What is the SI unit of specific resistance or resistivity?
  21. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
  22. What is the usual value of leakage coefficient for electrical machines?
  23. What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring…
  24. The reluctance of a magnetic circuit is not dependent on which of the following?
  25. Who discovered superconductivity in 1911?
  26. Electric potential is a _______ quantity.
  27. What is another name for relative permittivity?
  28. Electronic current in a wire is the flow of ____________ electrons.
  29. The core of a magnetic equipment uses a magnetic material with
  30. The unit of flux density is