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The B-H curve for ________ is a straight line passing through the origin.

A. cobalt

B. air

C. hardened steel

D. soft iron

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. The hot resistance of an incandescent lamp is about _______ its cold resistance.
  2. The emf induced in a coil due to the changing current of another neighboring coil is called
  3. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  4. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
  5. A one cubic cm of copper has how many free electrons at room temperature?
  6. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  7. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  8. Defined as a closed path in which magnetic induction or flux flows
  9. Which of the following is a paramagnetic material?
  10. The magnetic field of a magnetized iron bar when strongly heated
  11. What is the SI unit of conductivity?
  12. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  13. The reluctance of a magnetic circuit is not dependent on which of the following?
  14. One ampere- turn is equivalent to _____ gilberts
  15. The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
  16. What determines the value of the temperature coefficient of resistance of a material?
  17. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  18. The physical motion resulting from the forces of magnetic fields is called
  19. The electrons in the last orbit of an atom are called _______ electrons.
  20. What is used as the dielectric material in high voltage transformers?
  21. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  22. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
  23. ______ is an electromagnet with its core in the form of a close magnetic ring.
  24. Who developed the electromagnetic theory of light in 1862?
  25. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  26. Who discovereda the relationship between magnetism and electricity that serves as the foundation for…
  27. The relative permeability of a magnetic material is 10^5. What is its permeability?
  28. What is the unit of reluctance?
  29. The resistance of a material is ____________ its area of cross-section.
  30. The point in a magnet where the intensity of magnetic lines of force is maximum