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Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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  1. The unit of electrical energy is
  2. Which of the following materials has permeability slightly less than that of free space?
  3. This paper does not exhibit electricity because it contains the same number of
  4. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
  5. A substance that attracts pieces iron
  6. The conduction of electricity across the surface of a dielectric is called
  7. Which of the following is used by permanent magnets as the magnetic material?
  8. One electron volt (1 eV) is equivalent to _____ joules
  9. Electric field intensity is measured in
  10. A current if flowing east along a power line. If the earth's field is neglecteda the direction of the…
  11. Electric potential is a _______ quantity.
  12. The B-H curve for ________ is a straight line passing through the origin.
  13. Permanent magnets can be found in
  14. A negatively charge body has
  15. One of the common application of an air- cored choke.
  16. Which element has four valence electrons?
  17. Back emf refers to the
  18. If the magnetic material is located within a coil through which alternating current (60 Hz frequency)…
  19. The lagging effect between flux density of the material and the magne
  20. The ratio of the permeability of material to the permiabiity of air or vacuum.
  21. A positively charged body has
  22. The magnetic flux through a wire loop in a magnetic field does not d
  23. Ohm's law can be used only to a _____ circuit or component.
  24. All matters (gasa liquid and solid) are composed of
  25. The magnetic field around the conductor is determined by the
  26. Gases whose particles are charged are known as
  27. Cobalt is an example of a ______ material.
  28. Under ordinary conditionsa a body is considered
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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
  30. Ohm's law cannot be applied to which material?