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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. All magnetic field originates from
  2. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  3. An effect which is generally used in the gausameter to measure flux density.
  4. The permeability of permalloy is
  5. Back emf refers to the
  6. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  7. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material…
  8. Gases whose particles are charged are known as
  9. Core materials of a good relay have _________ hysteresis loop.
  10. Electric field intensity is a ________.
  11. The conduction of electricity across the surface of a dielectric is called
  12. How many electrons are needed in the valence orbit to give a material's stability?
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    If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 10^-8 ?a then its resistivity is
  14. Who discovered the most important electrical effects which is the magnetic effect?
  15. What is the measure of the density and sign of the electric charge at a point relative to that at some…
  16. The direction of force o a current carrying conductor placed in a m found by
  17. One weber of flux is equal to _______ magnetic lines of force.
  18. The greater percentage of materials is _________.
  19. The relative permeability of a magnetic material is 10^5. What is its permeability?
  20. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  21. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  22. One oersted (Oe) is equivalent to _____ Gb/cm.
  23. The B-H curve for ________ is a straight line passing through the origin.
  24. Who discovered that a current-carrying conductor would move when placed in a magnetic field?
  25. At/m is a unit of
  26. One of the solid structures in which the position of the atoms or ions are predetermined
  27. The evaporation of electrons from a heated surface is called
  28. What is used as the dielectric material in high voltage transformers?
  29. All matters (gasa liquid and solid) are composed of
  30. A group of magnetically aligned atoms is called