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Notes
SPI 0807:12.2
Electromagnetism
Science
The Cause of Magnetism
Atoms and Domains
In materials such as iron, nickel, and cobalt, groups of atoms are
in areas called domains.
The north and south poles in a domain line up and make a
strong magnetic field.
Notes
SPI 0807:12.2
Electromagnetism
Science
Electromagnetism
Is the interaction between electricity and magnetism.
Electric current produces a magnetic field.
An electromagnet consists of a solenoid wrapped around an
iron core.
Turning Electromagnets On and Off:
Unlike permanent magnets, electromagnets can be turned on
and off as needed.
Electromagnetic Strength
You can adjust the strength of an electromagnet two ways
1) Use more electrical current
2) Use more coils
Notes
SPI 0807:12.2
Electromagnetism
Science
How do we use electromagnets?
Found in electrical motors and switches
To lift objects
Example: Junkyard crane-magnets
Example: Maglev trains
To propel objects
Example: Railguns as weapons
Example: Railguns as launch platforms
To look inside of people
Example: Magnetic Resonance Imaging (MRI)
Notes
SPI 0807:12.2
Electromagnetism
How do we use electromagnets?
To lift objects
Example: Junkyard crane-magnets
Video Clip: Scrapyard Electromagnet In Action
Science
Notes
SPI 0807:12.2
Electromagnetism
Science
How do we use electromagnets?
To lift objects
Example: Maglev trains (magnetic leviation-reduces friction)
Video Clip: How Maglev Trains Work
Notes
SPI 0807:12.2
Electromagnetism
How do we use electromagnets?
To propel objects
Example: Railguns as weapons
Video Clip: U.S. Navy Railgun
Science
Notes
SPI 0807:12.2
Electromagnetism
How do we use electromagnets?
To propel objects
Example: Railguns as launch platforms (for space)
Science
Notes
SPI 0807:12.2
Electromagnetism
Science
How do we use electromagnets?
To propel objects
Example: Railguns as launch platforms (for aircraft)
Video Clip: Aircraft Carrier Launcher
Notes
SPI 0807:12.2
Electromagnetism
Science
How do we use electromagnets?
To look inside of people
Example: Magnetic Resonance Imaging (MRI)
 Video Clip: MRI Magnetic Field Strength