A “friend” borrows your favorite compass and paints the entire needle red. You discover this when...

A “friend” borrows your favorite compass and paints the entire needle red. You discover this when you are lost in a cave and have with you two flashlights, a few meters of wire, and (of course) your physics textbook. How might you discover which end of your compass needle is the north-seeking end?

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genius_generous answered 1 month ago

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