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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. Which of the following is a diamagnetic material?
  2. The magnetic potential in a magnetic circuit can be measured in terms of
  3. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  4. What is the SI unit of reluctance?
  5. Lenz's law is the consequence of the law of conservation of
  6. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing…
  7. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force…
  8. Which of the following magnetic materials can be easily magnetized in both direction?
  9. A positively charged body has
  10. One oersted (Oe) is equivalent to _____ Gb/cm.
  11. A t/m is a unit of
  12. An electron- volt (eV) is a unit of
  13. The reluctance of a magnetic circuit varies with
  14. The magnetic field of a magnetized iron bar when strongly heated
  15. The permittivity of a material is given by one of the following formulas.
  16. What is the other name for dielectric strength?
  17. Ohm's law can be used only to a _____ circuit or component.
  18. What is the measure of the density and sign of the electric charge at a point relative to that at some…
  19. When a current carrying conductor is placed in a magnetic fielda the maximum force will act on the conductor…
  20. Which of the following has the highest permeability?
  21. Which of the following materials has the least hysteresis loop area?
  22. The ratio of the permeability of material to the permiabiity of air or vacuum.
  23. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  24. The diameter of a hydrogen atom is approximately ______ cm.
  25. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
  26. The electrons in the last orbit of an atom are called _______ electrons.
  27. Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as
  28. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  29. Which of the following materials has the highest dielectric strength?
  30. If the number of valence electrons of an atom is less than 4a then the substance is probably