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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as

A. Hall effect

B. Grounding

C. Shielding

D. Limiting

Correct Answer : C.


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  1. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing…
  2. Back emf refers to the
  3. A negative ion results when an atom gains an additional
  4. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
  5. The unit of flux is _____ in cgs system.
  6. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material…
  7. What is the measure of the density and sign of the electric charge at a point relative to that at some…
  8. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  9. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force…
  10. The force acting on a unit n- pole placed at that point is called
  11. __________ is a substance of whose molecules consist of the same kind of atom.
  12. Another term for corona discharge.
  13. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  14. The force between two magnetic poles is _______ their pole strengths.
  15. The temperature coefficient of resistance of eureka is
  16. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  17. One coulomb of charge consists of ________ electrons.
  18. Electric field intensity at a point is numerically equal to ________ at that point.
  19. Cobalt is an example of a ______ material.
  20. A 200-watt lamp working for 24 hours will consume approximately _____ units.
  21. All magnetic field originates from
  22. The point in a magnet where the intensity of magnetic lines of force is maximum
  23. What is the practical unit of electrical energy?
  24. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
  25. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
  26. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
  27. Which of the following materials has the least hysteresis loop area?
  28. The B-H curve for ________ is a straight line passing through the origin.
  29. The unit of electrical energy is
  30. A group of magnetically aligned atoms is called