Magnet

Front 1

compass

Back 1

A magnetized pointer that shows the direction of magnetic north and bearings from it.

Front 2

Van Allen belts

Back 2

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

Front 3

magnetosphere

Back 3

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

Front 4

magnetic declination

Back 4

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 5

solar wind

Back 5

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

Front 6

aurora

Back 6

The dawn.

Front 7

magnet

Back 7

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 8

magnetic force

Back 8

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron.

Front 9

magnetic field

Back 9

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

Front 10

magnetic field lines

Back 10

A pictorial representation of magnetic field lines is very useful in visualizing the strength and direction of the magnetic field . The direction of magnetic field lines is defined to be the direction in which the north end of a compass needle points.

Front 11

magnetic pole

Back 11

Each of the two points or regions of an artificial or natural magnet to and from which the lines of magnetic force are directed.

Front 12

atom

Back 12

Atoms as a source of nuclear energy.An extremely small amount of a thing or quality.

Front 13

proton

Back 13

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 14

magnetic domain

Back 14

A magnetic domain is a region within a magneticmaterial in which the magnetization is in a uniform direction. This means that the individual magneticmoments of the atoms are aligned with one another and they point in the same direction.

Front 15

ferromagnetic material

Back 15

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

Front 16

temporary magnet

Back 16

A temporary magnet is a magnet that stays magnetized only for a relatively short period of time. Non- electromagnetic temporary magnets tend to be made of soft magnetic materials, like annealed iron or steel.

Front 17

permanent magnet

Back 17

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

Front 18

element

Back 18

Each of more than one hundred substances that cannot be chemically inter converted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e., the number of protons in the nuclei of its atoms.

Front 19

neutron

Back 19

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 20

nucleus

Back 20

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

Front 21

electron

Back 21

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