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. The resistivity of a conductor ___________ with an increase in temperature.
  2. The reluctance of a magnetic circuit is not dependent on which of the following?
  3. What is the unit of magnetomotive force?
  4. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
  5. Which of the following is a vector quantity?
  6. The phenomenon by which a subtracts pieces of iron
  7. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium…
  8. The magnetic field inside a solenoid
  9. Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of…
  10. What determines the atomic number of an element?
  11. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
  12. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
  13. The resistance of a material is ____________ its area of cross-section.
  14. Defined as a closed path in which magnetic induction or flux flows
  15. The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing…
  16. The B-H curve of ________ is not a straight line.
  17. What bond is formed when one or more electrons in the outermost energy orbit of an atom are transferred…
  18. A magnetic field is
  19. The relative permeability of a magnetic material is 10^5. What is its permeability?
  20. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  21. The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given…
  22. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  23. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
  24. The diameter of a hydrogen atom is approximately ______ cm.
  25. At/m is a unit of
  26. The idea of preventing one component from affecting another through their common electric and magnetic…
  27. One that has magnetic poles produced by internal atomic structure with no external current necessary
  28. The uncharged particles which have no effect on its atomic charge.
  29. The straight line passing through the two poles of magnet is called
  30. Ohm's law cannot be applied to which material?