Electromagnets
Wind an insulated wire many times round an iron nail and join its ends to a battery, and the nail becomes a magnet. It is a magnet only while electricity flows: open the circuit and it lets go. More turns of wire make it stronger. Cranes in scrapyards lift iron with big electromagnets.
Depth 1 · Foundation
You know that a wire coiled round iron makes a magnet that works only while electricity flows, and that more turns make it stronger.
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Foundation
You know that a wire coiled round iron makes a magnet that works only while electricity flows, and that more turns make it stronger.
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