Notes from P. 582 to 587

Here are my notes on the pages from 582 to 587:

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

-there are two different magnetic characteristics, labelled north and south.

 
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.

-a test compass is a gadget we use to map a magnetic field.

-Earth acts like a giant permanent magnet, producing its own magnetic field.

-Ferromagnetic metals are metals that attract magnets. It appears that all magnets are mad up of these materials. They are: Iron, Nickel, and Cobalt, or mixtures of the three.

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.

OERSTED'S PRINCIPLE: CHARGE MOVING THROUGH A CONDUCTOR PRODUCES A CIRCULAR MAGNETIC FIELD AROUND THE CONDUCTOR.

 -Mapping the magnetic field allows you to predict the direction of the electromagnetic force from the current. Scientists have developed several hand signs to help you predict how magnetic forces act. They are called right hand rules because they involve using your right hand.

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 the conventional, or positive, current flow. The curved fingers point in the direction of the magnetic field around the conductor.

-If the wire is coiled, the individual field lines fall on top of each other, thereby strengthening the overall field. Coiling the wire in a linear cylinder also straightens out the field.

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.

Here are some websites that talk about magnetics:
1.http://www.school-for-champions.com/science/magnetism.htm
2.http://www-spof.gsfc.nasa.gov/Education/Imagnet.html

Also, a very cool and easy to understand video:
Introduction to Magnetism