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A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

A. Joule's law

B. Faraday's law

C. Coulomb's law

D. Lenz' law

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  1. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  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…
  4. If the distance between two magnetic poles decreases by 2 timesa the force between them
  5. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  6. Electric field intensity is a ________.
  7. Materials whose permeabilities are slightly greater than that of free space
  8. Flux density is measured in
  9. A germanium atom has an atomic weight of72. How many neutrons are there?
  10. Electric field intensity at a point is numerically equal to ________ at that point.
  11. Electronic current in a wire is the flow of ____________ electrons.
  12. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  13. If the relative permittivity of a material is 10a then its permittivity is
  14. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  15. The force acting on a unit n- pole placed at that point is called
  16. When the relative permeability of a material is much greater than 1a it is called _______ material.
  17. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  18. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
  19. The emission of electrons from hot bodies is called
  20. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
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  22. Magnetic effects of the earth as a huge magnet with north and south poles.
  23. Which of the following is used by permanent magnets as the magnetic material?
  24. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  25. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  26. Ohm's law can be used only to a _____ circuit or component.
  27. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  28. The idea of preventing one component from affecting another through their common electric and magnetic…
  29. What determines the value of the temperature coefficient of resistance of a material?
  30. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability…