Khan Academy
Khan Academy: Discovery of Magnetism: Compass: Which Way Is North?
How would you know which way is north if you had no reference? Can the direction of stroke alone tell you this? Are you sure? [1:01]
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Build (Magnet Orientation)
When making a compass, does it matter if we stroke the needle with the North vs. South pole of the magnet? Why? [1:07]