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The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.

A. Skin effect

B. Walt effect

C. Hall effect

D. Edison effect

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  1. Which of the following magnetic materials can be easily magnetized in both direction?
  2. The magnetic potential in a magnetic circuit can be measured in terms of
  3. The ability of a material to conduct magnetic flux through it.
  4. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
  5. A good conductor has how many valence electrons?
  6. Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of…
  7. Defined as the number of lines per unit area through any substance in a plane at right angles to the…
  8. One farad equals
  9. What is the value of the absolute permittivity of air?
  10. A one cubic cm of copper has how many free electrons at room temperature?
  11. The point in a magnet where the intensity of magnetic lines of force is maximum
  12. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  13. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  14. Electric field intensity is measured in
  15. The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole…
  16. The core of a transformer heats up when its primary is fed from an ac source because of
  17. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  18. The force between two magnetic poles is _____ their poles strength.
  19. The mass of proton is __________ the mass of an electron.
  20. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  21. The B-H curve of ________ is not a straight line.
  22. The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given…
  23. Gases whose particles are charged are known as
  24. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  25. A positively charged body has
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    When the current flowsa the magnetic field . conductor is in what direction?
  27. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  28. Electronic current in a wire is the flow of ____________ electrons.
  29. Who discovered that a current-carrying conductor would move when placed in a magnetic field?
  30. Who discovered superconductivity in 1911?