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Steel is hard to magnetize because of its

A. Low permeability

B. High permeability

C. High density

D. High retentivity

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  1. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  2. What is the SI unit of specific resistance or resistivity?
  3. Who discovered superconductivity in 1911?
  4. A positively charged body has
  5. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  6. Another term for corona discharge.
  7. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  8. The dielectric constant of most materials lies between
  9. The relative permeability of a magnetic material is 10^5. What is its permeability?
  10. Which of the following statements is TRUE?
  11. Which of the following has the least number of valence electrons?
  12. One farad equals
  13. A group of magnetically aligned atoms is called
  14. What revolves about the positive nucleus in a definite orbit?
  15. Who developed the electromagnetic theory of light in 1862?
  16. Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as
  17. The emission of electrons from hot bodies is called
  18. An alloy of 40 percent iron and 60 percent nickel.
  19. The air space between poles of magnets
  20. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  21. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  22. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  23. The temperature coefficient of resistance of semiconductors is
  24. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab…
  25. The diameter of a hydrogen atom is approximately ______ cm.
  26. Electron is a Greek word for
  27. Electric field intensity at a point due to a given charge ______ if the relative permittivity of the…
  28. How many neutrons does a copper atom have?
  29. Core materials of a good relay have _________ hysteresis loop.
  30. Germanium atom has ______ protons and ______ electrons.