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The unit of electrical energy is

A. Joule

B. Watt- second

C. Kilowatt hour

D. All of these

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  1. The temperature coefficient of resistance of insulators is
  2. Flux linkages equals
  3. One of the common application of an air- cored choke.
  4. Which of the following is a paramagnetic material?
  5. The B-H curve of ________ is not a straight line.
  6. Who discovered that a current-carrying conductor would move when placed in a magnetic field?
  7. How many electrons are needed in the valence orbit to give a material's stability?
  8. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing…
  9. The phenomenon by which a subtracts pieces of iron
  10. The diameter of a hydrogen atom is approximately ______ cm.
  11. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  12. Paramagnetic substance has a relative permeability of
  13. Electromotive force in a circuit
  14. The conduction of electricity across the surface of a dielectric is called
  15. An atom or a group of atoms that carries a net electric charge.
  16. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
  18. Magnetic effects of the earth as a huge magnet with north and south poles.
  19. The force between two magnetic poles varies with the distance between them. The variation is ______…
  20. Core materials of a good relay have _________ hysteresis loop.
  21. The tiniest element of matter
  22. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  23. Which of the following is a vector quantity?
  24. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
  25. The temperature coefficient of resistance of conductors is
  26. The emf induced in a coil due to the change of its own flux linked with it is called
  27. If the length and area of cross-section of a wire are doubleda then its resistance
  28. All matters (gasa liquid and solid) are composed of
  29. The emf induced in a coil due to the changing current of another neighboring coil is called
  30. One electron volt (1 eV) is equivalent to _____ joules