Chapter 14 : Magnetism Flashcards
Give the definition for a magnetic field
a region in space i which a magnet of ferromagnetic material experiences a magnetic force
Give the definition for a pole
A region of high concentration of magnified lines
Give the definition of a magnetic domain
a region inside a magnetic that contains billions of atoms and each atom behaves like a small magnet
Give the definition for hysteresis
The tendency of a material to maintain its magnetic properties
Give the definition for Curie Temperature
A maximum temperature at which materials lose their magnetic characteristics
Give 5 properties of magnetic field lines
- invisible
- 3D
- Non-contact repulsion / attraction force
- Direction always from the North pole to the South pole
- The denser the magnetic field the string the magnetic field ( densest at the poles therefore strongest at the poles )
Go over drawing a magnetic field
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TRUE / FALSE
when a magnet is broken, the new little pieces create nee north and south poles
TRUE
why does a compass always point north?
The compass needle points north because the north pole of the magnet inside is attracted to the south pole of Earth’s built-in magnet
compass needle points to the earth’s magnetic north
🙇🏽♀️
Describe the angle of inclination (3)
- Magnetic N is 11° left of the rotation axis and magnetic S is 11° right if the rotation axis
- The 11° difference is called the angle of inclination
name 4 importance’s of the earths magnetic field
- Birds navigated by making use of earth’s magnetic field during migration
- earth’s magnetic field traps charged particles that are blown towards the upper atmosphere of the earth by solar wind from the sun
- charged particles can damage telecommunications
- charged particles travel along the magnetic field lines of the earth until they get close to the earth’s magnetic poles -> here they collide with air molecules causing = aurora
name 3 ferromagnetic material
- iron
- nickel
- cobalt
describe the magnetic domains in an unmagnetized ferromagnetic material and a magnetized
- unmagnetized -> domains are aligned in different directions-> magnetic field is 0
- magnetized -> domain aligns itself with the external magnetic field
what is hard iron
keeps its magnetic characteristics for a long time ; often used in permanent magnets
what is soft iron
easily magnetized and unmagnetized
domain aligns itself quickly and can easily swing outta the parallel arrangement
what is curie temperature
maximum temperature at which materials lose their magnetic characteristics
- kinetic energy that is transferred causes the magnetic domain to move out of arrangement or out of line
how do you store a permanent magnets?
stored at room temperature
how do you store bar magnets?
stored parallel to each other with opposite poles facing each other
DO NOT DROP OR HAMMER MAGNETS
the domains will be unaligned
