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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. Another term for corona discharge.
  2. When the relative permeability of a material is slightly more than 1a it is called ______ material.
  3. Germanium atom has ______ protons and ______ electrons.
  4. __________ is a substance of whose molecules consist of the same kind of atom.
  5. A 6- V battery is connected across a solenoid of 100 turns having a resistance of 2 ?a Calculate the…
  6. The magnetic field of a magnetized iron bar when strongly heated
  7. What determines the atomic number of an element?
  8. The relative permeability of a magnetic material is 10^5. What is its permeability?
  9. Who discovered superconductivity in 1911?
  10. How many electrons are needed in the valence orbit to give a material's stability?
  11. Defined as a closed path in which magnetic induction or flux flows
  12. Who demonstrated the theory of electromagnetic induction in 1831?
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    When the current flowsa the magnetic field . conductor is in what direction?
  14. Back emf refers to the
  15. The temperature coefficient of resistance of insulators is
  16. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
  17. One of the solid structures in which the position of the atoms or ions are predetermined
  18. A magnetizing force of 1000 AT/m will produce a flux density of __________ i
  19. The air space between poles of magnets
  20. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  21. The permittivity of a material is given by one of the following formulas.
  22. The resistance of a material is ____________ its area of cross-section.
  23. Core materials of a good relay have _________ hysteresis loop.
  24. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  25. The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?
  26. When the relative permeability of a material is much greater than 1a it is called _______ material.
  27. The magnetic field of a bar magnet most closely resembles the magnetic field of
  28. Electronic current in a wire is the flow of ____________ electrons.
  29. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  30. Steel is hard to magnetize because of its