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Electricity and Magnetism

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  • True or False: The magnetosphere extends through the atmosphere into space.
    True
  • Where is Earth's magnetic north pole?
    In the South Pole
  • What does maglev use to move a train forward?
    Magnets
  • How does a speaker produce sound?
    The cone inside the speaker vibrates
  • What force are electricity and magnetism two aspects of?
    Electromagnetism
  • How do we show bar magnets that are attracted to each other in a diagram?
    With lines that connect or extend from one magnet to the other.
  • What does an electromagnet produce when switched on?
    A magnetic field
  • In a compass, the magnetized steel needle points to Earth's north pole, which is actually what?
    The magnetosphere's south pole
  • What can we use the thermal effect of electricity for?
    To cook, heat water, dry our hair, etc.
  • Who invented the first simple electromagnetic motor?
    Faraday
  • What does all matter consist of?
    Atoms
  • Do electrons have a positive or negative charge?
    Negative
  • True or false: Bar magnets CAN'T be switched on or off.
    True
  • What does maglev stand for?
    Magnetic Levitation
  • What machine in hospitals uses magnets?
    Magnetic Resonance Imaging (MRI) Machine
  • What is the cone attached to in a speaker?
    A magnet that is attracted to a magnetic field
  • How can we identify a magnet?
    By testing to see if it repels another magnet
  • How do we show bar magnets that repel each other in a diagram?
    The lines don't connect or join up.
  • What do electrons orbit around?
    The nucleus
  • What does the magnetosphere protect the Earth from?
    Harmful rays from the Sun
  • What hits a bell to produce sound in an electric bell?
    A hammer
  • What is electrolysis?
    A chemical reaction caused by an electric current through a liquid solution of charged particles.
  • What can we use to show a magnetic field?
    Iron filings
  • What can electrolysis be used for?
    To electroplate metal objects
  • What did Ampere discover?
    The Electron
  • What does an electric current in addition to thermal energy and a magnetic field?
    Chemical reactions
  • Who discovered that electricity and magnetism are connected?
    Oersted
  • What is thermal energy?
    Energy that produces heat
  • What is the center of the Earth made of?
    Liquid Iron
  • An electromagnet can be used to separate mixtures containing which metals?
    Iron or steel
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