Magnets Sec3

Front 1

compass

Back 1

an instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it.

Front 2

Magnetic declination

Back 2

Magnetic declination or variation is the angle on the horizontal plane between magnetic north (the direction the north end of a compass needle points, corresponding to the direction of the Earth's magnetic field lines) and true north (the direction along a meridian towards the geographic North Pole).

Front 3

van allen belts

Back 3

each of two regions of intense radiation partly surrounding the earth at heights of several thousand kilometers.

Front 4

solar wind

Back 4

the continuous flow of charged particles from the sun that permeates the solar system.

Front 5

magnetosphere

Back 5

the region surrounding the earth or another astronomical body in which its magnetic field is the predominant effective magnetic field.

Front 6

aurora

Back 6

a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, usually near the northern or southern magnetic pole.

Front 7

atom

Back 7

atoms as a source of nuclear energy.

Front 8

element

Back 8

a part or aspect of something abstract, especially one that is essential or characteristic.

Front 9

nucleus

Back 9

the central and most important part of an object, movement, or group, forming the basis for its activity and growth.

Front 10

proton

Back 10

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Front 11

neutron

Back 11

a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Front 12

electron

Back 12

a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Front 13

magnetic domain

Back 13

A magnetic domain is region in which the magnetic fields of atoms are grouped together and aligned. In the experiment below, the magnetic domains are indicated by the arrows in the metal material. You can think of magnetic domains as miniature magnets within a material.

Front 14

ferromagnetic materia

Back 14

Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. In physics, several different types of magnetism are distinguished.

Front 15

temporary magnet

Back 15

A magnet, such as that made of soft iron, which retains its magnetism for brief periods, as opposed to a permanent magnet,

Front 16

permanent magnet

Back 16

a magnet that retains its magnetic properties in the absence of an inducing field or current.

Front 17

magnet

Back 17

a piece of iron (or an ore, alloy, or other material) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.

Front 18

magnet pole

Back 18

each of the points near the extremities of the axis of rotation of the earth or another celestial body where a magnetic needle dips vertically.

Front 19

magnet force

Back 19

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion; the basic force responsible for the action of electric motors and the attraction of magnets for iron

Front 20

magnet feild

Back 20

a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

Front 21

magnet field lines

Back 21

A pictorial representation of magnetic field lines is very useful in visualizing the strength and direction of the magnetic field .