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If the number of valence electrons of an atom is more than 4a the substance is called

A. a semiconductor

B. a conductor

C. an insulator

D. a semi-insulator

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  1. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  2. Lenz' law states that the direction of the induced emf and hence current
  3. The force between two magnetic poles is _____ their poles strength.
  4. If the value of 25 of a conductor is 1/230 per oCa then the value of 0is
  5. The force between two charges placed a given distance apart ______ as the relative permittivity of the…
  6. The core of a transformer heats up when its primary is fed from an ac source because of
  7. The temperature coefficient of resistance of semiconductors is
  8. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  9. The magnetic flux of 2000 lines is how many Maxwells?
  10. When the relative permeability of a material is slightly more than 1a it is called ______ material.
  11. If the length and area of cross-section of a wire are doubleda then its resistance
  12. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely…
  13. Temporary magnets are commonly employed in
  14. The idea of preventing one component from affecting another through their common electric and magnetic…
  15. An electron- volt (eV) is a unit of
  16. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  17. Which of the following is a diamagnetic material?
  18. The tiniest element of matter
  19. Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
  20. A one cubic cm of copper has how many free electrons at room temperature?
  21. Flux linkages equals
  22. A permanent magnet does not exert a force on
  23. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  24. The emission of electrons from hot bodies is called
  25. Cobalt is an example of a ______ material.
  26. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
  27. If the relative permittivity of a material is 10a then its permittivity is
  28. The resistance of a material is ____________ its area of cross-section.
  29. Who discovered superconductivity in 1911?
  30. The force between two magnetic poles is _____ the relative permeability of the medium.