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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. One coulomb of charge consists of ________ electrons.
  2. The emf induced in a coil due to the changing current of another neighboring coil is called
  3. The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of…
  4. The reluctance of the magnetic circuit is ________ relative permeability of the material comprising…
  5. A good conductor has how many valence electrons?
  6. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
  7. This paper does not exhibit electricity because it contains the same number of
  8. Hipernik is an alloy containing __________ iron and __________ nickel.
  9. A principle that states that only two electrons with different spins are allowed to exist in a given…
  10. What is the SI unit of conductivity?
  11. The phenomenon by which a subtracts pieces of iron
  12. The ratio between the intensity of magnetization produced in a substance to the magnetizing force producing…
  13. Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through…
  14. The force between two magnetic poles is _____ their poles strength.
  15. The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization…
  16. An atom or a group of atoms that carries a net electric charge.
  17. Hysteresis is a phenomenon of _________ in a magnetic circuit.
  18. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  19. Referred to as the specific reluctance of a material
  20. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  21. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  22. Who developed the electromagnetic theory of light in 1862?
  23. If the number of valence electrons of an atom is less than 4a the substance is called
  24. Which of the following materials has the least hysteresis loop area?
  25. The magnetic flux of 2000 lines is how many Maxwells?
  26. A t/m is a unit of
  27. A magnetic material losses its ferromagnetic properties at a point called
  28. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  29. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  30. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force…