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The core of a magnetic equipment uses a magnetic material with

A. Least permeability

B. Low permeability

C. Moderate permeability

D. High permeability

Correct Answer : D.


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  1. The phenomenon that when an electric current passes through an anisotropic crystala there is an absorption…
  2. If the number of valence electrons of an atom is more than 4a the substance is called
  3. A negative ion results when an atom gains an additional
  4. Magnetic effects of the earth as a huge magnet with north and south poles.
  5. Paramagnetic substance has a relative permeability of
  6. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
  7. The reluctance of a magnetic circuit is not dependent on which of the following?
  8. Core materials of a good relay have _________ hysteresis loop.
  9. One coulomb of charge consists of ________ electrons.
  10. The physical motion resulting from the forces of magnetic fields is called
  11. This paper does not exhibit electricity because it contains the same number of
  12. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  13. Which element has four valence electrons?
  14. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in

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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
  16. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
  17. Small voltages generated by a conductor with current in an external magnetic field.
  18. Which of the following magnetic materials can be easily magnetized in both direction?
  19. The force between two magnetic poles varies with the distance between them. The variation is ______…
  20. The uncharged particles which have no effect on its atomic charge.
  21. Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring…
  22. When the relative permeability of a material is slightly more than 1a it is called ______ material.
  23. The force between two magnetic poles is _____ their poles strength.
  24. An electron- volt (eV) is a unit of
  25. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  26. What is used as the dielectric material in high voltage transformers?
  27. The reluctance of the magnetic circuit is ________ relative permeability of the material comprising…
  28. Which of the following materials has the least hysteresis loop area?
  29. An alloy of 22 percent iron and 78 per cent nickel.
  30. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…