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This quiz contains 7 questions from a mix of 1 subtopics.
What is the main difference between bar magnets and electromagnets?
bar magnets are made of iron, while electromagnets are made of copper.
electromagnets are stronger than bar magnets.
bar magnets are used in electric motors, while electromagnets are not.
bar magnets have a permanent magnetic field, while electromagnets can be turned on and off.
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What happens when an electric current flows through a wire?
it creates no field around the wire.
it creates a circular magnetic field around the wire.
it creates an electric field around the wire.
it creates a gravitational field around the wire.
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Which of the following is true about a solenoid?
it is a wire coiled into a spiral.
all of the above.
it is used to make electromagnets.
when a current passes through it, the magnetic field is concentrated along its length.
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What is the term for a wire coiled into a spiral?
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What material is used for the core of an electromagnet because it magnetises and demagnetises easily?
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Explain how a simple electric motor works.
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List three ways to increase the strength of an electromagnet.
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