Electromagnetism Answers
Which electromagnet is the strongest?
A bar magnet is a permanent magnet, while an electromagnet is a temporary magnet.Why is an electromagnet temporary?
An electromagnet is caused by the flow of electric current. The electromagnet is only on while current is flowing. When the current is turned off, the electromagnet turns off.
What did you include in your response? Check all that apply.
Which factors affect the strength of an electromagnet? Check all that apply. the direction of the current flowing through the wirethe amount of current flowing through the wirethe number of coils in the wirethe material of the wirethe material of the core
decreases✔ increasesdoes not change
Nineteenth century English scientist Michael Faraday found that if he moved a magnet through a loop of wire, an electric current flowed in that wire.What process did Faraday discover?
Suppose you take a short piece of wire that is not attached to anything and move it up and down in a magnetic field. Explain whether or not a current will be induced, and why.
A current will not be induced because the wire is not part of a closed circuit. The electrons have no place to flow to.
What did you include in your response? Check all that apply.
a wire coilan iron bar✔ a magnet
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