Which of the following is used by permanent magnets as the magnetic material?

A. iron

B. nickel

C. soft steel

D. hardened steel

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  4. The magnetic field of a bar magnet most closely resembles the magnetic field of
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  7. Used to maintain strength of magnetic field
  8. A magnetic field is
  9. Electron is a Greek word for
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  12. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  13. The temperature coefficient of resistance of semiconductors is
  14. One of the solid structures in which the position of the atoms or ions are predetermined
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  17. The greater percentage of materials is _________.
  18. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  19. There are how many compounds available in nature?
  20. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  21. The magnetic flux through a wire loop in a magnetic field does not d
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  23. An effect which is generally used in the gausameter to measure flux density.
  24. The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole…
  25. The magnetic flux of 2000 lines is how many Maxwells?
  26. The force between two magnetic poles is _____ the relative permeability of the medium.
  27. Electric field intensity is measured in
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  29. The relative permeability of a magnetic material is 10^5. What is its permeability?
  30. Which of the following has the highest permeability?