Magnetism Facts
Magnetism Facts
- The direction of a magnetic field is defined by the direction a compass needle points.
- Magnetic fields point from the north to the south outside the magnet and south to north inside the magnet.
- Magnetic flux is measured in webers.
- Left hands are for negative charges and right hands are for positive charges.
- The first hand rule deals with the B-field around a current bearing wire, the third hand rule looks at the force on charges moving in a B-field, and the second hand rule is redundant.
- Solenoids are stronger with more current or more wire turns or adding a soft iron core.