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42 Multiple choice questions

  1. the best material to make a magnet rapidly gain and rapidly lose magnetization; an alloy of nickel and iron in approzimately a 3 to 1 ratio
  2. True or False: Electrons flow from negative to postive.
  3. term for iron magnets and other easily demagnetized magnets
  4. term for the amount of charge that, in each second, passes a given point on the conductor
  5. term for a piece of soft iron that can be placed across the poles at the end of each pair of magnets when they are put away
  6. term for a material that is strongly attracted to a magnet because it has two or more unpaired electrons per atom
  7. Magnetizing an object by bringing it into the presence of an existing magnet is called magnetization by _____.
  8. term for the field strength at a particular point in a magnetic field
  9. Danish physicist who found that an electric current affects the magnetic meedle of a compass
  10. two ways to magnetize an object
  11. term for the total number of lines falling on any surface, or the total magnetic influence playing oupon a surface
  12. term for when an electron seems to spin but does not actually spin
  13. term for isolated north poles and south poles that might occur somewhere in nature
  14. The lines of flux are more concentrated where the magnetic field is ____.
  15. term for a solenoid with a core of iron, permalloy, or similar material
  16. term for highly permeable materials that resist penetration by lines of flux
  17. term for the spin axes of all the unpaired electrons pointing in the same direction
  18. another term for magnetic induction
  19. term for a material that has only one unpaired elctron per atom, and is weakly attracted to a magnet
  20. term for the current that, when flowing in each of two long, parallel conductors spaced one meter apart in a vacuum, would give rise to a force of exactly 2 x 10^7 N upon any meter length of either conductor
  21. the law that states that unlike poles attract whereas like poles repel
  22. term for magnetic moment produced by electrons
  23. term for a magnetic form of iron ore
  24. the rule that states that if the thumb of the right hand is pointed along a conductor in the direction of positive current, the fingers encircle the conductor in the direction of the north-moving field
  25. the rule that states that if you point your right thumb in the direction of positive current, your extended index finger points in the direction of magnetic induction
  26. term for a material that is repelled by a magnet
  27. term for an electron that rotates on its own axis
  28. term that describes electricity through a circuit as positive charges flowing from positive to negative
  29. term for a long series of adjacent loops in the form of a helix or a loose coil; becomes a magnet when current passes through the wire
  30. The extent to which a material absorbs lines of flux is related to its _____, or how strongly it is magnetized by a magnetic field.
  31. the rule that says that negative current flows the oposite direction of positive current
  32. term used for any piece of magnetized rock since it had value in giving direction
  33. term for the end of a lodestone that gains a north-ward direction
  34. term for a small region containing billions or trillions of atoms with aligned magnetic poles
  35. term for the end of a lodestone that gains a southward direction
  36. Lines of flux must be drawn as ___ ___.
  37. Magnetizing an object by stroking or touching it with an existing magnet is called magnetization by ____.
  38. The direction of field strength acting on an isolated north pole is _____ to a line of flux at every point.
  39. the value of the permeability constant for a vacuum
  40. A magnetic pole is always paired with its opposite; thus, every magnet is ____.
  41. term for lines on diagrams or drawings that show which ways the north and south poles point
  42. term for an alloy of aluminum, nickel, cobalt, and iron in various proportions, of which many permanent magnets are made