Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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  1. Lenz's law is the consequence of the law of conservation of
  2. The straight line passing through the two poles of magnet is called
  3. The unit of flux is _____ in cgs system.
  4. Magnetic intensity is a
  5. States that the ratio of the thermal conductivity is proportional to the absolute temperature for all…
  6. The core of a transformer heats up when its primary is fed from an ac source because of
  7. The mass of proton is __________ the mass of an electron.
  8. Defined as the number of lines per unit area through any substance in a plane at right angles to the…
  9. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  10. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
  11. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
  12. The force which set ups or tends to set up magnetic flux in a magnetic circuit
  13. Which of the following statements is TRUE?
  14. What is the diameter of an atom?
  15. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  16. The simplest type of atom to exist is the ______ atom.
  17. Materials whose permeabilities are slightly greater than that of free space
  18. A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the…
  19. Which element has four valence electrons?
  20. The temperature coefficient of resistance of eureka is
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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
  22. Electric field intensity at a point due to a given charge ______ if the relative permittivity of the…
  23. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  24. One farad equals
  25. If the value of 0 a conductor is 1/234 per oCa then the value of 18is
  26. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  27. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  28. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  29. An electron- volt (eV) is a unit of
  30. Who discovered the most important electrical effects which is the magnetic effect?