Back emf refers to the

A. Current equal to the applied emf

B. Opposing emf

C. Current opposing the applied emf

D. Voltage opposing the applied emf

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  1. The force between two magnetic poles is _______ their pole strengths.
  2. The tiniest element of matter
  3. Magnetic effects of the earth as a huge magnet with north and south poles.
  4. The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing…
  5. A substance that attracts pieces iron
  6. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability…
  7. A germanium atom has an atomic weight of72. How many neutrons are there?
  8. Refers to the magnetic lines
  9. The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization…
  10. Which of the following is a natural magnet?
  11. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  12. The unit of flux density is
  13. What is the main advantage of temporary magnets?
  14. Electron is a Greek word for
  15. One that has magnetic poles produced by internal atomic structure with no external current necessary
  16. Germanium atom has ______ protons and ______ electrons.
  17. The unit of electrical energy is
  18. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  19. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  20. The force between two magnetic poles varies with the distance between them. The variation is ______…
  21. The resistivity of a conductor ___________ with an increase in temperature.
  22. The core of a magnetic equipment uses a magnetic material with
  23. Which of the following materials has the highest dielectric strength?
  24. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  25. The temperature coefficient of resistance of eureka is
  26. How many electrons are needed in the valence orbit to give a material's stability?
  27. The temperature coefficient of resistance of semiconductors is
  28. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional…
  29. The K shell or the first shell has how many permissible number of orbiting electrons?
  30. Electromotive force in a circuit