Construct an electromagnet by wrapping about 1 meter of
Chapter 19, Problem 19.73(choose chapter or problem)
Construct an electromagnet by wrapping about 1 meter of small-diameter insulated wire around a steel nail. Tape the ends of the wires to a D-cell battery as in Figure A19.3. How many staples or paper clips can you pick up with your electromagnet? How would you increase the magnetic eld set up by the nail? Disconnect the wires fromthe battery and test how much magnetism is retained by the nail by seeing how many staples it can pick up. A convenient way to test the strength of a magnet is to attach a paper clip to a rubber band. Note how far the rubber band is stretched before the clip comes free of the magnet. Test your electromagnet in this way. Where is the magnetic eld of the electromagnet strongest, at the ends of the nail or near its center? When you have your nail magnetized, bang it against a table or the oor and then check its magnetism. Why does the nail lose its magnetism by this procedure?
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