Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.

A. Ewing's theory of ferromagnetism

B. Oersted's ferromagnetism theory

C. Maxwell's magnetic theory

D. Ampere's circuital law

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  1. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  2. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  3. The temperature coefficient of resistance of semiconductors is
  4. The magnetic materials should have a large hysteresis loss for one of the following applications.
  5. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
  6. A test charge means a charge of
  7. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
  8. Under ordinary conditionsa a body is considered
  9. The simplest type of atom to exist is the ______ atom.
  10. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  11. Permeability means
  12. The core of a transformer heats up when its primary is fed from an ac source because of
  13. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
  14. What is the main advantage of temporary magnets?
  15. The air space between poles of magnets
  16. If the value of 25 of a conductor is 1/230 per oCa then the value of 0is
  17. Temporary magnets are commonly employed in
  18. All matters (gasa liquid and solid) are composed of
  19. Which of the following has the highest permeability?
  20. Lenz's law is the consequence of the law of conservation of
  21. Who discovered the most important electrical effects which is the magnetic effect?
  22. Electrons at the outer shell are called
  23. The total number of magnetic lines of force in a magnetic field is called
  24. The emf induced in a coil due to the changing current of another neighboring coil is called
  25. The magnetic energy stored in an inductor is ______ current.
  26. A magnetic field is
  27. The emission of electrons from hot bodies is called
  28. Ohm's law cannot be applied to which material?
  29. Which of the following is used by permanent magnets as the magnetic material?
  30. How much is the flux in Weber in the above problem?