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Making an electromagnet
Running an electric current through a wire makes it a little bit magnetic. The magnetism can be increased by winding the wire round many times. Presenter Dr Yan makes a powerful electromagnet by wrapping copper wire around pieces of iron and attaching a small battery. He creates an electromagnet strong enough to suspend him from the ground. Published as part of the Bang Goes the Theory website: bbc.co.uk/bang/. Please note this clip is only available in Flash.
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