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When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is

A. Greatly decreased

B. Greatly increased

C. Slightly decreased

D. Slightly increased

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  1. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  2. Which of the following has the least number of valence electrons?
  3. The temperature coefficient of resistance of eureka is
  4. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  5. A t/m is a unit of
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  10. The ratio of the permeability of material to the permiabiity of air or vacuum.
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  13. Under ordinary conditionsa a body is considered
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  15. An atom or a group of atoms that carries a net electric charge.
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  18. Flux linkages equals
  19. Which of the following is a diamagnetic material?
  20. The net electrical charge in an isolated system remains constant. This is known as
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  22. What is the value of the absolute permittivity of air?
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  24. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
  25. What determines the value of the temperature coefficient of resistance of a material?
  26. One that has magnetic poles produced by internal atomic structure with no external current necessary
  27. The B-H curve for ________ is a straight line passing through the origin.
  28. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  29. The force between two magnetic poles is _______ their pole strengths.
  30. If the length and area of cross-section of a wire are doubleda then its resistance