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Khan Academy
Khan Academy: Discovery of Magnetic Fields: Magnet Near Compass
An experiment exploring the effect of a permanent magnet on a compass. What is going on? [1:05]
Khan Academy
Khan Academy: Earth's Magnetic Field (How to Measure)
How can we describe the strength of the Earth's magnetic field using a magnet and a compass? What does this tell us? Watch this demonstration to find out. [1:16]