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Which element has four valence electrons?

A. Conductor

B. Insulator

C. Semiconductor

D. Semi- insulator

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  1. The magnetic field inside a solenoid
  2. One oersted (Oe) is equivalent to _____ Gb/cm.
  3. If the distance between two magnetic poles decreases by 2 timesa the force between them
  4. Permeability means
  5. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
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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
  7. Under ordinary conditionsa a body is considered
  8. Who discovereda the relationship between magnetism and electricity that serves as the foundation for…
  9. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  10. Which of the following electric quantities is vector in character?
  11. Who discovered superconductivity in 1911?
  12. Which of the following is used by temporary magnets as the magnetic material?
  13. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
  14. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  15. Lenz' law states that the direction of the induced emf and hence current
  16. Electric field intensity is measured in
  17. What is another name for relative permittivity?
  18. A positively charged body has
  19. What is the relative permittivity of air?
  20. Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
  21. The unit of flux is _____ in cgs system.
  22. A group of magnetically aligned atoms is called
  23. The magnetic field of a magnetized iron bar when strongly heated
  24. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  25. The core of a magnetic equipment uses a magnetic material with
  26. A t/m is a unit of
  27. How many electrons are needed in the valence orbit to give a material's stability?
  28. The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of…
  29. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
  30. What is the SI unit of reluctance?