An alloy of 22 percent iron and 78 per cent nickel.

A. Permalloy

B. Alnico

C. Constantan

D. M anganin

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  1. What is the diameter of an atom?
  2. If the length and area of cross-section of a wire are doubleda then its resistance
  3. Under ordinary conditionsa a body is considered
  4. Which of the following is a diamagnetic material?
  5. The quantity 10^6 maxwells is equivalent to one
  6. The magnetic field of a bar magnet most closely resembles the magnetic field of
  7. The force between two magnetic poles is _______ their pole strengths.
  8. If the value of 0 a conductor is 1/234 per oCa then the value of 18is
  9. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
  10. A good conductor has how many valence electrons?
  11. ______ is an electromagnet with its core in the form of a close magnetic ring.
  12. The greater percentage of materials is _________.
  13. The current of electric circuit is analogous to which quantity of a m
  14. The unit of flux density is
  15. __________ is a substance of whose molecules consist of the same kind of atom.
  16. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  17. A t/m is a unit of
  18. Who demonstrated the theory of electromagnetic induction in 1831?
  19. A positively charged body has
  20. The evaporation of electrons from a heated surface is called
  21. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  22. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
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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
  24. This paper does not exhibit electricity because it contains the same number of
  25. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  26. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  27. Electrons at the outer shell are called
  28. Ohm's law cannot be applied to which material?
  29. What is the main advantage of temporary magnets?
  30. The temperature coefficient of resistance of conductors is