Who discovered superconductivity in 1911?

A. Kamerlingh Onnes

B. Alex Muller

C. GeoryBednorz

D. Charles Coulomb

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  1. The core of a transformer heats up when its primary is fed from an ac source because of
  2. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
  3. A group of magnetically aligned atoms is called
  4. What determines the value of the temperature coefficient of resistance of a material?
  5. Defined as the number of lines per unit area through any substance in a plane at right angles to the…
  6. Another term for corona discharge.
  7. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  8. An electron- volt (eV) is a unit of
  9. Permanent magnets can be found in
  10. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
  11. When the relative permeability of a material is slightly more than 1a it is called ______ material.
  12. A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.
  13. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  14. One weber of flux is equal to _______ magnetic lines of force.
  15. The straight line passing through the two poles of magnet is called
  16. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  17. The dielectric constant of most materials lies between
  18. Which of the following is a natural magnet?
  19. The magnetic energy stored in an inductor is ______ current.
  20. The net electrical charge in an isolated system remains constant. This is known as
  21. The evaporation of electrons from a heated surface is called
  22. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
  23. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  24. The unit of electrical energy is
  25. What revolves about the positive nucleus in a definite orbit?
  26. If the number of valence electrons of an atom is more than 4a the substance is called
  27. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
  28. One oersted (Oe) is equivalent to _____ Gb/cm.
  29. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  30. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability…