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