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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. The force between two magnetic poles is _____ the relative permeability of the medium.
  2. The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge…
  3. How much is the flux in Weber in the above problem?
  4. The force between two magnetic poles is _____ their poles strength.
  5. The electrons in the last orbit of an atom are called _______ electrons.
  6. Hydrogen is an example of a _____ material.
  7. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  8. When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every…
  9. Gases whose particles are charged are known as
  10. The ability of a material to conduct magnetic flux through it.
  11. Which of the following is a paramagnetic material?
  12. Which of the following has the highest permeability?
  13. What is the cgs unit of magnetomotive force?
  14. When the relative permeability of a material is much greater than 1a it is called _______ material.
  15. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
  16. Ohm's law cannot be applied to which material?
  17. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force…
  18. Defined as the number of lines per unit area through any substance in a plane at right angles to the…
  19. The temperature coefficient of resistance of eureka is
  20. The force which set ups or tends to set up magnetic flux in a magnetic circuit
  21. What is the relative permittivity of air?
  22. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  23. The resistivity of a conductor ___________ with an increase in temperature.
  24. One electron volt (1 eV) is equivalent to _____ joules
  25. Which of the following is used by permanent magnets as the magnetic material?
  26. What is the unit of magnetomotive force?
  27. The current of electric circuit is analogous to which quantity of a m
  28. The ability of a mechanically stressed ferromagnetic wire to recognize rapid switching of magnetization…
  29. Germanium atom has ______ protons and ______ electrons.
  30. What is the value of the absolute permittivity of air?