ch19_lecture-1-S08-9.ppt - Chapter 19 Magnetism Chapter...

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Chapter 19 Magnetism Chapter 19 Magnetism Magnetic Field Electric Current and Magnetic field Force on an Electric Current in a Magnetic Field Force on an Moving Electric Charge in a Magnetic Field
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Maglev Train Maglev Train
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More than 30 magnets in a car More than 30 magnets in a car
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Magnetic Resonance Magnetic Resonance Imaging (MRI) Imaging (MRI)
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Magnetic Resonance Imaging (MRI) An imaging technique used primarily in medical settings to produce high quality images of the inside of the human body MRI is based on the principles of nuclear magnetic resonance (NMR) The human body is primarily fat and water The human body is primarily fat and water . . Fat and water have many hydrogen atoms which make Fat and water have many hydrogen atoms which make the human body approximately 63% hydrogen atoms. Hydrogen nuclei have an NMR signal. the human body approximately 63% hydrogen atoms. Hydrogen nuclei have an NMR signal. For these reasons magnetic resonance imaging primarily images the NMR signal from the hydrogen nuclei. For these reasons magnetic resonance imaging primarily images the NMR signal from the hydrogen nuclei.
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National High Magnetic Field Laboratory National High Magnetic Field Laboratory Tallahassee, Florida NMR Facility DC Magnets Condensed Matter Groups Offices Hybrid Magnet 45 T mK Lab (20 T)
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1.43GW Generator (600MW, 600MJ) 60T controlled Pulse Magnet, 32 mm liq. N bore 45 T hybrid, 32 mm bore 12 T, 40 cm warm bore MRI magnet (Magnex) High B/T Facility Operated by: Florida State University University of Florida Los Alamos National Lab Supported by: National Science Foundation State of Florida
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Nature of Magnetism Nature of Magnetism 2 1 + Q +Q F 12 F 21 r 12 I I F F I I F F
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Magnetic Force Magnetic Force The forces that come into being when electric currents interact are called magnetic forces magnetic forces , or magnetic forces magnetic forces arise from the interactions of moving charges arise from the interactions of moving charges . (The electrical force is between two charges at rest at rest ) There is only a single interaction between charges, electromagnetic interaction. It is always possible to separate the force on a charge into an electric part, which is independent of its motion, and a magnetic part, which is proportional to its speed relative to the observer.
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This note was uploaded on 02/27/2010 for the course PHYSICS 215 taught by Professor Lawn during the Spring '10 term at Academy of Art University.

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ch19_lecture-1-S08-9.ppt - Chapter 19 Magnetism Chapter...

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