P. 582-589 notes

The magnetic force

-Magnetic field is the distribution of a magnetic force in the region of a magnet.

-Magnets also attract Ferromagnetic Magnets which are iron, nickel and cobalt.

-Demagnetization is when the Ferromagnetic materials lose their magnetic strength.

-Reverse magnetization is the polarity of magnets reversed.

-Breaking of a large magnet is breaking large magnets into smaller magnets.

-Maximum strength is a magnet which can only become so strong and no more.

-The Domain theory of magnet states that large magnets are composed of smaller magnets which are rotatable. Rotatable magnets are known as Dipoles.
-domains that are pointing in random directions can be alligned if they are placed in a large field with a fixed direction.
-domains could lose their order and point in different directions, causing a dilution and overall weakening of the magnet.
-Large magnetic fields pointing in the opposite direction cause all the domains to line up with the new field, reversing the overall magnetic polarity.
-In all the pieces, the domains still line up, so each acts like its own magnet.
-Once all the domains are aligned, there is no way to increase the magnet's strength any further.

- Normal magnets can never be shut off. However, scientists created the Electrical Magnet which can be shut off at will.

-Oersted Principal- Charge moving through a conductor produces a circular magnetic field around the conductor.

-The Right hand rule are several hand signs to help you predict how magnetic forces act.

-The 2 right hand rules:

Conventional flow #1- use your right hand pointing in the direction of conventional or positive (+) and the curved fingers point in the direction of the magnetic field around the conductor. This shows how it can predict the direction of the magnetic field around a straight conductor.


Conventional flow #2- use your right hand with curved fingers pointing in the direction of conventional or positive (+), current flow. the thumb points in 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. This predicts the relationship between the direction of conventional current flow in a coil and the direction of the magnetic field at the end of the electromagnet.