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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