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It is 1834, and you have just heard of this marvelous new phenomenon called eddy currents. Some fellow named Lenz discovered them, and you’re curious if you can find out something special about them y ...
You are lost in the wilderness. You know there is a highway several miles north of you, but you don’t know which direction north is. Luckily, you have a magnet with you! How can you find your way usin ...