The air space between poles of magnets

A. Air gap

B. Free space

C. Vacuum

D. Atmosphere

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  1. Which of the following magnetic materials can be easily magnetized in both direction?
  2. What is the SI unit of magnetic flux?
  3. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  4. Which of the following statements is TRUE?
  5. The uncharged particles which have no effect on its atomic charge.
  6. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  7. If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
  8. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  9. At/m is a unit of
  10. Which of the following has the highest permeability?
  11. A permanent magnet does not exert a force on
  12. The science of adapting electronics to aerospace flight.
  13. The branch of Engineering which deals with the magnetic effect of electric current is known as
  14. A magnetic field is
  15. The diameter of a hydrogen atom is approximately ______ cm.
  16. If the number of valence electrons of an atom is exactly 4a then the substance is called
  17. All matters (gasa liquid and solid) are composed of
  18. Who developed the electromagnetic theory of light in 1862?
  19. Gases whose particles are charged are known as
  20. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  21. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flowa…
  22. The core of a transformer heats up when its primary is fed from an ac source because of
  23. What is the unit of magnetomotive force?
  24. The magnetic flux through a wire loop in a magnetic field does not d
  25. If the value of 25 a conductor is 1/255 per oCa then the value of 20is
  26. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  27. Steel is hard to magnetize because of its
  28. Lenz' law states that the direction of the induced emf and hence current
  29. If the distance between two magnetic poles decreases by 2 timesa the force between them
  30. What is the SI unit of conductivity?