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Which of the following could you do to increase the strength of an electromagnet?

Which of the following could you do to increase the strength of an electromagnet?-example-1
User JChat
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Change the core from wood to iron. This is because iron is a magnetic material while wood is not magnetic hence cant acquire magnetism. Other factors that would increase the strength of electromagnet would be; increasing the amount of electric current, and increasing the number of winding's.

User Chocospaz
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