Which of the following is a natural magnet?

A. Steel

B. Magnesia

C. Lodestone

D. S oft iron

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  1. The conduction of electricity across the surface of a dielectric is called
  2. Hysteresis is a phenomenon of _________ in a magnetic circuit.
  3. The reluctance of a magnetic circuit is not dependent on which of the following?
  4. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  5. Core materials of a good relay have _________ hysteresis loop.
  6. Under ordinary conditionsa a body is considered
  7. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely…
  8. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  9. The force between two magnetic poles is _______ their pole strengths.
  10. The permeability of permalloy is
  11. A negatively charge body has
  12. The simplest type of atom to exist is the ______ atom.
  13. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
  14. Who discovered that a current-carrying conductor would move when placed in a magnetic field?
  15. The current of electric circuit is analogous to which quantity of a m
  16. A substance that attracts pieces iron
  17. Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through…
  18. Steel is hard to magnetize because of its
  19. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  20. The physical motion resulting from the forces of magnetic fields is called
  21. Who discovered the most important electrical effects which is the magnetic effect?
  22. The resistance of a material is ____________ its area of cross-section.
  23. The core of a transformer heats up when its primary is fed from an ac source because of
  24. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  25. What is used as the insulating material or dielectric in an electric ion
  26. One electron volt (1 eV) is equivalent to _____ joules
  27. What is the unit of magnetomotive force?
  28. A negative ion results when an atom gains an additional
  29. The reluctance of the magnetic circuit is ________ relative permeability of the material comprising…
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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6