All magnetic field originates from

A. moving electric charge

B. Iron atoms

C. Magnetic domain

D. Permanent magnets

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  1. The permeability of permalloy is
  2. Who discovered the most important electrical effects which is the magnetic effect?
  3. Which of the following is used by temporary magnets as the magnetic material?
  4. The temperature coefficient of resistance of semiconductors is
  5. If the number of valence electrons of an atom is exactly 4a then the substance is called
  6. A 200-watt lamp working for 24 hours will consume approximately _____ units.
  7. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  8. A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the…
  9. The K shell or the first shell has how many permissible number of orbiting electrons?
  10. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  11. The energy stored in an electrostatic field or electromagnetic field is called
  12. A negatively charge body has
  13. The B-H curve of ________ is not a straight line.
  14. Lenz's law is the consequence of the law of conservation of
  15. What is another name for relative permittivity?
  16. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  17. What revolves about the positive nucleus in a definite orbit?
  18. One weber of flux is equal to _______ magnetic lines of force.
  19. Which of the following is a paramagnetic material?
  20. What is used as the insulating material or dielectric in an electric ion
  21. What is the SI unit of conductance?
  22. The unit of flux density is
  23. How is mutual inductance between two coils decreased?
  24. The magnetic energy stored in an inductor is ______ current.
  25. When the relative permeability of a material is slightly less than 1a it is called _____ material.
  26. Which of the following magnetic materials can be easily magnetized in both direction?
  27. Flux density is measured in
  28. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  29. What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred…
  30. It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.