Magnetism
Bar magnets have distinct N & S poles
- Break a bar magnet in two, & get two smaller magnets
Like poles repel; unlike poles attract
- Attraction & repulsion cause magnets to align themselves with external magnetic fields
- Use magnetic field lines to denote magnetic field about a magnetic source
- Field lines emerge from N poles, & enter S poles of magnets
Magnetic field generated within Earth, called the geomagnetic field, surrounds us