To make a compass, point an ordinary iron nail alongthe
Chapter 9, Problem 49(choose chapter or problem)
To make a compass, point an ordinary iron nail alongthe direction of Earths magnetic field (which, in theNorthern Hemisphere, is angled downward as well asnorthward) and repeatedly strike it for a few secondswith a hammer or a rock. Then suspend it at its centerof gravity by a string. Why does the act of strikingmagnetize the nail?
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