Magnetic Forces
Yet another kind of force
- Known since prehistory – lodestone compasses used in China thousands of years ago
- Bar Magnets: Two poles (North & South)
- Force description: Like poles repel; Unlike poles attract.
Explanation?
- Is there a magnetic charge (analogous to electric charge) ?
- Try to isolate the charges: cut the magnet in half:
- In fact, no experiment to date (and there have been many attempts) has shown evidence for the existence of magnetic charge. We believe the source of the magnetic force is not a new kind of charge, but is due to motion of electric charge.