A magnetic field is

A. The current flow through space around a permanent magnet

B. The force set up when current flows through a conductor

C. The force that drives current through a resistor

D. The force between the plates of a charged capacitor

You can do it
  1. Magnetic field intensity is a ________ quantity.
  2. A commercial alloy of aluminum nickela and iron with cobalta copper and titanium added to produce about…
  3. Which of the following is used by permanent magnets as the magnetic material?
  4. Electric potential is a _______ quantity.
  5. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square…
  6. The evaporation of electrons from a heated surface is called
  7. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  8. The reluctance of a magnetic circuit is not dependent on which of the following?
  9. The temperature coefficient of resistance of conductors is
  10. What is the main advantage of temporary magnets?
  11. How many electrons are needed in the valence orbit to give a material's stability?
  12. The force between two magnetic poles is _____ their poles strength.
  13. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional…
  14. One weber of flux is equal to _______ magnetic lines of force.
  15. The electrons in the last orbit of an atom are called _______ electrons.
  16. As the magnetic intensity decreasesa the relative permeability of a magnetic material
  17. The relative permeability of a magnetic material is 10^5. What is its permeability?
  18. The property of a material which opposes the creation of magnetic flux in it
  19. Who demonstrated the theory of electromagnetic induction in 1831?
  20. In electro-mechanical conversion devices like generators and motors the reason why a small air gap is…
  21. How many neutrons does a copper atom have?
  22. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material…
  23. The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab…
  24. The energy stored in an electrostatic field or electromagnetic field is called
  25. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing…
  26. How is mutual inductance between two coils decreased?
  27. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
  28. A t/m is a unit of
  29. The force between two magnetic poles is _______ their pole strengths.
  30. The reluctance of a magnetic circuit varies with