Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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  1. A group of magnetically aligned atoms is called
  2. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  3. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
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    If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 10^-8 ?a then its resistivity is
  5. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
  6. Which of the following materials has permeability slightly less than that of free space?
  7. Cobalt is an example of a ______ material.
  8. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  9. Defined as the flux density produced in it due to its own induced magnetism
  10. What is the typical saturation flux density for most magnetic materials?
  11. The permittivity of a material is given by one of the following formulas.
  12. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  13. What is the SI unit of reluctance?
  14. Magnetic fields do not interact with
  15. Which of the following materials has the highest dielectric strength?
  16. Which of the following has the least number of valence electrons?
  17. The magnetic flux of 2000 lines is how many Maxwells?
  18. A test charge means a charge of
  19. The B-H curve for ________ is a straight line passing through the origin.
  20. An electron- volt (eV) is a unit of
  21. Steel is hard to magnetize because of its
  22. Which of the following is a diamagnetic material?
  23. Ohm's law can be used only to a _____ circuit or component.
  24. The B-H curve of ________ is not a straight line.
  25. If the number of valence electrons of an atom is more than 4a the substance is called
  26. Hysteresis is a phenomenon of _________ in a magnetic circuit.
  27. What is the relative permittivity of air?
  28. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional…
  29. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
  30. The direction of force o a current carrying conductor placed in a m found by