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Neutralize a compass

How to neutralize a compass using two needles. How could this help us later? Why does this work? Created by Brit Cruise.

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Video transcript

Both needles magnetized. . . . . . . . . . . . . . . . . . . . . . . . (Magnetic) NORTH (Magnetic) SOUTH. . . . . . . . . . . . . . . . . . . . . Neutralized. Lost.