The temperature coefficient of resistance of semiconductors is

A. positive

B. zero

C. negative

D. infinite

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  1. Electric lines of force leave or enter the charge surface at an angle of
  2. The physical motion resulting from the forces of magnetic fields is called
  3. The ability of a material to conduct magnetic flux through it.
  4. A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6
  5. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  6. One coulomb of charge consists of ________ electrons.
  7. If the number of valence electrons of an atom is more than 4a the substance is called
  8. Amorphous solid is also called
  9. The total number of magnetic lines of force in a magnetic field is called
  10. At/m is a unit of
  11. Which element has four valence electrons?
  12. The force between two magnetic poles is _____ their poles strength.
  13. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
  14. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  15. Lenz's law is the consequence of the law of conservation of
  16. The customary energy unit in atomic and nuclear physics is
  17. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  18. The branch of Engineering which deals with the magnetic effect of electric current is known as
  19. Magnetic intensity is a
  20. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
  21. ______ is an electromagnet with its core in the form of a close magnetic ring.
  22. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  23. Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as
  24. Temporary magnets are commonly employed in
  25. What is the SI unit of specific resistance or resistivity?
  26. Ohm's law cannot be applied to which material?
  27. The quantity 10^6 maxwells is equivalent to one
  28. One electron volt (1 eV) is equivalent to _____ joules
  29. What is the cgs unit of magnetomotive force?
  30. If the number of valence electrons of an atom is exactly 4a then the substance is called