Magnetism test

• Transformer


  A device that uses electromagnetic induction to increase or decrease the voltage of an alternating current “transforming” the amount of voltage.
• Motor


  Device that uses electric current to create a rotational motion.
• Stator


  Part of the generator that contains the wires in which current is to be induced.
• Generator


  A device that uses mechanical energy to generate electricity through electromagnetic induction.
• Magnetic Field line


  Illustrate the magnitude and direction of a magnetic field.
• The strength of a magnetic field is measured in 


  Tesla
• North Pole


  End of a magnet that is attracted to geographical South Pole On Earth.
• Ferromagnetic


  Elements that are naturally magnetic like iron, nickel, and cobalt.
• South Pole


  End of magnet that Is attracted to the geographical North Pole of the earth.
• Permanent magnet


  A magnet that retains its magnetism under normal conditions.
• Magnetic domain


  Areas of ferromagnetic materials that contain these aligned atoms.
• Induced magnetism


  Objects that are magnetic only when electric current is flowing.
• Electromagnet


  magnetism that is only present only when an electric current is flowing.
• When a magnet is allowed to swing freely, it comes to rest aligned in an east west direction.

  False
• A compass is a small magnet mounted so that it is free to turn.

  True
• Like poles attract eachother

  False
• Magnets do not always have two opposite magnetic poles

  False
• If earth is considered to be a giant magnet, the south pole of the magnet is near Earths geographic North Pole.

  True
• Heating a permanent magnet can demagnetize it.

  True
• When a piece of iron is not in a magnetic field, the domains point in random directions.

  True
• In permanent magnets the domains point in random directions

  False
• The direction of magnetization in rocks on the seafloor varies, indicating that the north and south poles of Earth have reversed many times

  True
• Magnetic field lines travel in a Circle around the entire magnet, while never touching the magnet

  False
• If you cut a magnet in half it becomes demagnetized

  False