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The Cause of Magnetism

SPI 0807:12.2 Electromagnetism. Notes. 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. SPI 0807:12.2

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The Cause of Magnetism

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  1. SPI 0807:12.2 Electromagnetism Notes 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.

  2. SPI 0807:12.2 Electromagnetism Notes 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

  3. 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)

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

  5. 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 Work

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

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

  8. 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 Launcher

  9. 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 Strength

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