- Not all metal objects are magnetic, but those with iron typically are.
- Magnets are essentially objects with their domains aligned, and can occur naturally or be made by rubbing a magnet against a ferromagnetic materials or creating a magnetic field, typically using a coil of wire with current.
- Magnets can also be destroyed by messing up the domains, typically by impact or heating.
- Magnetic fields will create a force when it is coupled with an electrical field or current, typically perpendicular to the magnetic field.
- Magnetic fields can be created by a current in a long straight wire or a solenoid.
*Note: Mu-naught/2pi is essentially just 2x10^-7, simply remembering that value will suffice.
Want the more detailed derivations of some of the equations? Here they are:
Much of the rest are simply common sense and implications of the right hand rules, so there isn't much point in showing their derivations (as there really isn't much to show).