Unit 4 Magnetism
Coil
A wire ____ will increase the magnetic field.
One
An air core has a permeability of ___
Increases
An iron core _____ the number of flux lines
Concentrated
An iron core provides an easy path for flux lines become _______ and the field strength increases.
Permanent Magnet
Electrons Pairs spinning action causes each electron to become a tiny _____ _____
Magnetite
First noticed to attract iron
Current
Increasing the ____ will increase the magnetic field strength.
Repel
Magnetic flux lines ____ each other and never cross
Flow
Magnetic flux lines do not flow, but have a north and south direction.
Flux
Magnetic line of force are called ____
Spin
One theory if magnetism states that electrons ___ on their own axis while orbiting the nucleus.
Southern Hemisphere
The Earth's magnetic north pole is located in the__________
Earth's axis poles
The _____ and magnetic poles are not aligned
lodestones
The compass stones or leading stone became know as _____
Current
The magnetic field usually only lasts as long as ____ is flowing.
Permeability
The measure of a materials willingness to become magnetized.
Iron, Nickle, and Cobalt
These magnetic materials have regions of magnetic polarity called magnetic domains.
English, CGS, And MKS
Three Types of Energy Systems
Iron, Nickel, and Cobalt
Three substances that form natural magnets
Ferromagnetic, Paramagnetic, and Diamagnetic
Three types of magnetic materials
Loops
Turns or ____ increase the magnetic field strength.
Aligned
When the magnetic domains are _____ on an axis, the material is magnetized.
Disarray
When the magnetic domains are in _____, the material is not magnetized.
Conductor
Whenever an electric current flow through a _____, a magnetic field is formed around the _____.
Magnetism
___ Is one of the most important natural phenomena
Core material
____ _______ is the base that the wires are wound around.
Cores
____ made from magnetic materials like iron greatly increase the field strength.
Lodestones
_____ align with the Earth's magnetic poles
Nonmagnetic
_____ core materials are referred to as air cores
Reluctance
_____ is Resistance to magnetism
Energy
_____ is required to create a magnetic field, but no _____ is required to maintain a magnetic field. This is one of the basic laws of magnetism.
Magnetic Force
_______ was known over 2,000 years ago by Greeks
Angle of declination
is the difference in alignment between the Earth's magnetic pole and the axis pole.
Paramagnetic
_____ materials are not as easily magnetized.(ex: Platinum, Titanium, and Chromium)
Diamagnetic
_____ materials cannot be magnetized.(Copper, Brass, and Antimony)
Electromagnets
______ depend on current flow to produce a magnetic field.
Permanent magnets
______ do not require any power to maintain their field
Ferromagnetic
______ materials are easily magnetized(ex: Iron, Nickel, and Cobalt)
Diamagnetic
______ materials can be metal or nonmetal
Electron Pairs
_______ ____ general spin in opposite directions.
Hard
Permeability of one is ____ to magnetize.
Negate
The electrons tend to form pairs spinning in opposite directions, these pairs ___ each other's magnetism.
