Magnetism

Created By: Mr. Mossey

Magnetism

Force of attraction or repulsion

of a magnetic material due to the arrangement of its atoms

Dependant on atomic structure

Magnetic Poles Either north or south, these are the areas where magnetic effect is the strongest

Always appear in pairs

Like Poles = Repulsion Different Poles = Attraction

Magnetic Field

Region in which magnetic forces act

Can be represented with lines

Forms complete loops from north to south poles

Magnets

Permanent Magnets Do not lose charge easily

Can be made of

nickel & cobalt

Temporary Magnets Lose charge easily

Can be made of soft iron

Magnetic Domain

Groups of atoms with electrons that

align themselves in one direction This results in regions of grouped magnetic fields

Magnetic Domain

Each group is a magnetic domain (group of atoms with aligned electrons).

Cancel each other out

Subjected to a field all the magnetic domains line up creating a magnet

Additive

Note: You can even destroy a permanent magnet by forceful rearrangement of the magnetic domains

Earth Magnet William Gilbert = first to propose Earth as a magnet

Earth exerts a magnetic force and is surrounded by a magnetic field.

Earth poles do reverse as told by hardened molten rock

Compasses North pole of a compass must point to magnetic south pole

Results in north pole being next to magnetic south pole

Magnetic Variation is the difference between geographic and magnetic poles

Weakest at the equator

Jupiter, Saturn, and the Sun also produce magnetic fields

Solar Wind Charged particles sent out by the sun

Magnetosphere Region of Earths magnetic field

Blocks solar wind from damaging Earth

Van Allen Radiation Charged particles that penetrate the magnetosphere and cycle between the poles

When close to the atmosphere they cause the air to glow (Aurora)