Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

A. Luigi Galvani

B. Hans Christian Oersted

C. Charles Coulomb

D. Andre Ampere

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  1. The magnetic potential in a magnetic circuit can be measured in terms of
  2. A law relating between the magnetic and electric susceptibilities and the absolute temperatures which…
  3. What is the relative permittivity of air?
  4. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
  5. Which of the following is a natural magnet?
  6. The process by which an emf and hence current is generated or induced in a conductor when there is a…
  7. The dielectric constant of most materials lies between
  8. A good conductor has how many valence electrons?
  9. The permittivity of a material is given by one of the following formulas.
  10. The phenomenon by which a subtracts pieces of iron
  11. What is the practical unit of electrical energy?
  12. Which of the following is a diamagnetic material?
  13. If the number of valence electrons of an atom is less than 4a the substance is called
  14. Permeance is analogous to
  15. An electron- volt (eV) is a unit of
  16. The physical motion resulting from the forces of magnetic fields is called
  17. What is the SI unit of reluctance?
  18. What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5…
  19. This paper does not exhibit electricity because it contains the same number of
  20. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  21. If the length and area of cross-section of a wire are doubleda then its resistance
  22. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely…
  23. What is the unit of magnetomotive force?
  24. Materials whose permeabilities are slightly greater than that of free space
  25. How many neutrons does a copper atom have?
  26. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  27. An alloy of 22 percent iron and 78 per cent nickel.
  28. The unit of flux density is
  29. One of the solid structures in which the position of the atoms or ions are predetermined
  30. A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?