Ten Points For Magnetism

1. Magnetic field--the distribution  of a magnetic force in a region of a magnet.
2. similar magnetic poles, north and north or south and south, repel one another with a force at a distance. Dissimilar poles, north and south, attract one another with a force at a distance.

3. Domain Theory all large magnets are made up of many smaller and rotatable magnets, called dipoles, which can interact with other dipoles close by. If dipoles line up, then a small magnetic domain is produced.
4. Oersted's Principle Charge moving through a conductor produces a circular magnetic field around the conductor.

5. Right-hand rule #1(RHR#1) for conventional current flow Grasp the conductor with the thumb of the right hand pointing in the direction of conventional, or positive(+), current flow. The curved fingers point in the direction of the magnetic field around the conductor.

6. Left-hand rule #1 for conductors Grasp the conductor with your left hand such that the thumb points in the direction of electron(-) current flow. The curved fingers point in the direction of the circular magnetic field around the conductor.
7. Right-hand rule #2(RHR#2) for conventional current flow Grasp the coiled conductor with the right hand such that curved fingers point in the direction of conventional, or positive(+), current flow. The thumb points in the direction of the magnetic field within the coil. Outside the coil, the thumb represents the north(N) end of the electromagnet produced by the coil.
8. Left-hand rule #2 for coiled conductors Grasp the coiled conductor with the left hand such that the curled fingers point in the direction of the electron（-）current flow through the conductor. The thumb points in the direction of the magnetic field within the coil. Outside the coil, the thumb represents the north(N) end of the electromagnet produced by the coil.
9. The magnetic field strength, B, is measured in units called tesla (T).1T is the magnetic field strength when a 1m long conductor, carrying a current of 1A, crosses a magnetic field at 90°, experiencing a magnetic force of 1N.
  the equation is 1T = 1N/A·m
10. Iron, nickel, and cobalt are ferromagnetic metals.