Magnetism Flashcards
Properties of magnets
- repel / attract
- free 1 part points north
- contains magnetic field
Magnetic Poles
every magnet has 2 poles - north & south
Magnetic Force
push or pull (area around the magnet)
Magnetic Field
field lines that curve from NORTH TO SOUTH pole - same direction & do not intersect
Single Magnetic Field
Pg 9
Combined Magnetic Field North / North or South / South
Pg 11
Combined Magnetic Field North / South
Pg 11
Atom Structure
non-living, nucleus has neutrons / protons, spinning electrons on outside in shells
Magnetic Domains
most electrons randomly move - if lined up forms a domain
Ferromagnetic Material & Example
magnetic material - iron, nickel, and cobalt
Magnetic Law
magnets can be made, destroyed, or broken apart
Making Magnets
- put material in magnetic field
- rub it on something magnet can make temporary magnets
Destroying Magnets
- hit material hard to unalign the domains
- heat it up
Breaking Magnets
- split it - makes to different magnets (2 poles each)
Earth as a Magnet
Sir WIlliam Gilbert discovered compass ALWAYS points north due to metals in the core producing a magnetic field
Magnetic Declination
distances between compass north and geographical north - different due to shifting plates on earth’s crust
Earth’s Magnetic Field Affects Items How?
as metallic materials lie on earth’s crust becomes magnetic itself
Magnetic Earth to Determine Rock Layers
earth contains magnetic rock that will line up with the poles that causes layers & scientist use the layers to date rocks / fossils around it
Magnetosphere
earth’s magnetic field (1,000-25,000 kilometers up)
Van Allen Belts
doughnut shaped regions that protons / electrons travel very fast & push on the earth’s magnetic field
Van Allen Belts Cause?
- solar winds
- auroras (if particles get close to earth’s surface)
Explanation of Magnetic Declination
due to mid-ocean ridges (Atlantic ocean) getting bigger but subduction (Pacific ocean) getting smaller - the difference in true north
