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 Science SPI 0807:12.2 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. SPI 0807:12.2 Electromagnetism Notes Science Electromagnetic Strength  You can adjust the strength of an electromagnet two ways 1) Use more electrical current 2) Use more coils

SPI 0807:12.2 Electromagnetism Notes 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)

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To lift objects Example: Junkyard crane-magnets  Video Clip: Scrapyard Electromagnet In ActionScrapyard Electromagnet In Action

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To lift objects Example: Maglev trains (magnetic leviation-reduces friction)  Video Clip: How Maglev Trains WorkHow Maglev Trains Work

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To propel objects Example: Railguns as weapons  Video Clip: U.S. Navy RailgunU.S. Navy Railgun

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To propel objects Example: Railguns as launch platforms (for space)

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To propel objects Example: Railguns as launch platforms (for aircraft)  Video Clip: Aircraft Carrier LauncherAircraft Carrier Launcher

SPI 0807:12.2 Electromagnetism Notes Science How do we use electromagnets?  To look inside of people Example: Magnetic Resonance Imaging (MRI)  Video Clip: MRI Magnetic Field StrengthMRI Magnetic Field Strength