write three difference between a bar magnet or an electromagnet
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bar magnet
*can be demagnetized.
*polarity can be changed.
*magnetic strength can be changed.
electromagnet
*cannot be demagnetized.
*polarity is fixed.
*magnetic strength is fixed.
*can be demagnetized.
*polarity can be changed.
*magnetic strength can be changed.
electromagnet
*cannot be demagnetized.
*polarity is fixed.
*magnetic strength is fixed.
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