A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.

A. Hall's law

B. Joule's law

C. Child's law

D. Coulomb's law

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  1. Permeability means
  2. How is mutual inductance between two coils decreased?
  3. What is another name for relative permittivity?
  4. Which of the following has the least number of valence electrons?
  5. The simplest type of atom to exist is the ______ atom.
  6. The hot resistance of an incandescent lamp is about _______ its cold resistance.
  7. Which of the following materials has the highest dielectric strength?
  8. Refers to the magnetic lines
  9. Defined as the flux density produced in it due to its own induced magnetism
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  12. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  13. The force between two magnetic poles is _____ the relative permeability of the medium.
  14. The contribution to the ionization in an ionization chamber by electrons liberated from t he walls.
  15. Who discovereda the relationship between magnetism and electricity that serves as the foundation for…
  16. The unit of electrical energy is
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  18. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  19. The evaporation of electrons from a heated surface is called
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  22. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
  23. If the relative permittivity of a material is 10a then its permittivity is
  24. Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of
  25. The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability…
  26. A principle that states that only two electrons with different spins are allowed to exist in a given…
  27. The B-H curve for ________ is a straight line passing through the origin.
  28. A one cubic cm of copper has how many free electrons at room temperature?
  29. The ability of a material to conduct magnetic flux through it.
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