The air space between poles of magnets

A. Air gap

B. Free space

C. Vacuum

D. Atmosphere

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  1. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  2. The ratio of the permeability of material to the permiabiity of air or vacuum.
  3. Permeance is analogous to
  4. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  5. Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as
  6. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
  7. The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force…
  8. Magnetic fields do not interact with
  9. When the relative permeability of a material is slightly less than 1a it is called _____ material.
  10. What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring…
  11. ______ is an electromagnet with its core in the form of a close magnetic ring.
  12. The force which set ups or tends to set up magnetic flux in a magnetic circuit
  13. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  14. The force between two magnetic poles is _______ their pole strengths.
  15. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
  16. A magnetic material losses its ferromagnetic properties at a point called
  17. Lenz' law states that the direction of the induced emf and hence current
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    When the current flowsa the magnetic field . conductor is in what direction?
  19. The magnetic field inside a solenoid
  20. The force acting on a unit n- pole placed at that point is called
  21. The resistivity of a conductor ___________ with an increase in temperature.
  22. Germanium atom has ______ protons and ______ electrons.
  23. The net electrical charge in an isolated system remains constant. This is known as
  24. Which element has four valence electrons?
  25. How many electrons are needed in the valence orbit to give a material's stability?
  26. Which of the following has the highest permeability?
  27. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
  28. Another term for corona discharge.
  29. A 200-watt lamp working for 24 hours will consume approximately _____ units.
  30. The emf induced in a coil due to the change of its own flux linked with it is called