Does the amount of wire in an electromagnet effect its strength?
Yes, in a general sense. The strength of the electromagnet is
determined by the product of the current through the wires and the number of
turns of wire. Using a narrower wire raises the resistance and
so lowers the effective current - therefore a wider wire increases
the strength. Also, the more turns, the stronger, so the longer
the wire the better.
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Update: June 2012