Physics #2, Chapter 16

Front 2

Magnetic poles

Back 2

*every magnet has two, north and south

Front 3

magnetic

Back 3

* the ability to exert forces on magnets or other magnetic materials
*can create magnetic effects by itself.

Front 4

Permananet magnets

Back 4

*a material that keeps its magnetic properties, even when it is not close to other magnets.

Front 5

Poles

Back 5

*all have magnetic poles, north and south.
*if cut in half, it still has poles

Front 6

magnetic force

Back 6

*opposite poles attract
*same poles repel

Front 7

materials are transparent to magnetic forces

Back 7

*magnetic forces can pass through many materials with no apparent decrease in strength.

Front 8

the magnetic field:
how to describe magnetic forces?

Back 8

*forces are generated between 2 magnets.
* a way to find the force is with a long complicated formula (scientific method) OR
*an ease way-to get another magnet that is small enough not to affect the magnetic force.

Front 9

drawing the force

Back 9

*the magnetic force of a magnet points away from the north pole and toward the south pole of the magnet.
*this is because the north pole of the test magnet repelled from the north and attracted to the south pole.

Front 10

the magnetic field

Back 10

*the drawing is called a magnetic field.
*the quantity that has a value at all points in space.
*creates a magnetic field and then the field applies a force on another magnet
*can be call a "force field" created by a magnet

Front 11

paramagnetic

Back 11

*example: aluminum
* the magnetism of individual electrons does not cancel completely.

Front 12

soft magnet

Back 12

*example: steel
* a magnet that is easy to magnetize but loses its magnetization easily.
*heat, shock, and other magnets demagnatize steel

Front 13

ferromagnetic

Back 13

*small group of metals that have strong magnetic properties
examples: iron, nickel and cobalt

Front 14

hard magnets

Back 14

*materials that make beeter permanent magnets.
*the domains in hard magnets tend to remain aligned for a long time.
*strong electromagnets are used to magnetize hard magnets.

Front 15

field lines

Back 15

*the source magnet creates the magnetic field and the magnetic field lines run from the north pole of the magnet to the south pole of the magnetic field.

Front 16

electromagnets

Back 16

*are magnets created by electric current flowing in wires.
*a simple example: a coil wrapped around an iron core

Front 17

right hand rule

Back 17

*use the fingers of your R hand - curl in the direction of current, your thumb points toward the magnets north pole.

Front 18

diamagnetic

Back 18

*in many elements the magnetic field of individual electrons in each atom cancel with each other.
This leaves the whole atom with zero met magnetic field.

Front 19

ways to demagnetize

Back 19

*heating them, shocking them, dropping them, subjecting them to a stronger magnetic field.

Front 20

ways to increase strength of a magnet

Back 20

*increase turns, and use more permeable core material
*refer to the book/ pg 365 in the book)

Front 21

What are magnetic domains?

Back 21

*groups of neighboring atoms whose magnetic fields are similarily aligned.

Front 22

source of magnetism

Back 22

*magnetism is created by moving charges, either in an electric current or in the atoms that make up material.