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A substance that attracts pieces iron

A. Conductor

B. Semiconductor

C. Magnet

D. All of the above

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  1. The magnetic flux of 2000 lines is how many Maxwells?
  2. There are how many compounds available in nature?
  3. A substance that attracts pieces iron
  4. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  5. Core materials of a good relay have _________ hysteresis loop.
  6. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability…
  7. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  8. When a current carrying conductor is placed in a magnetic fielda the maximum force will act on the conductor…
  9. Permanent magnets can be found in
  10. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  11. The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given…
  12. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  13. One oersted (Oe) is equivalent to _____ Gb/cm.
  14. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  15. The force between two magnetic poles is _______ their pole strengths.
  16. Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
  17. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  18. Which of the following is a diamagnetic material?
  19. What is the cgs unit of magnetomotive force?
  20. Germanium atom has ______ protons and ______ electrons.
  21. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
  22. The dielectric constant of most materials lies between
  23. The greater percentage of materials is _________.
  24. What is the SI unit of reluctance?
  25. The magnetic field around the conductor is determined by the
  26. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  27. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  28. The temperature coefficient of resistance of semiconductors is
  29. The magnetic energy stored in an inductor is ______ current.
  30. The emission of electrons from hot bodies is called