magnetic fields september 30, 2013 october 2, 2013
TRANSCRIPT
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Magnetic Fields
September 30, 2013
October 2, 2013
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The Force Between Two Bar Magnets
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Origins of Magnetism
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Magnetic Domains
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• What would happen if you cut the magnet in half (between the north and south poles)?
Inside Permanent Magnets (and Ferromagnetic Materials)
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Magnets Always Have Two Poles
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Magnetic Field of a Bar Magnet
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Thought Questions
• Do you notice anything strange about the direction of the field lines? Which way does the compass point?
• Draw field lines for the Earth’s magnetic field.
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Magnetic Field of the Earth
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Magnetic Field Lines Using Iron Filings
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Continuity of Field Lines
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Magnetic Field produced by a Current-Carrying Wire
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Direction for 3-D in 2-D
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Which way does the current flow?
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Where is the magnetic field strength the greatest?
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The Solenoid
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Effects of Magnetic Fields on Charged Particles
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The Magnetic Force for Positive and Negative Charges
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The Magnetic Force on a Moving Charged Particle
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What Direction is the Force?
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What are the Different Charges?
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Differences Between Motion in Electric and Magnetic Fields
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Circular Motion in a Magnetic Field
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Magnetic Force on a Current-Carrying Wire
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The Magnetic Force on a Current-Carrying Wire
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The Magnetic Force Between Current-Carrying Wires
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The Magnetic Force Between Current-Carrying Wires
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Group Discussion
• Walker, Chapter 22 (pp. 742-743)
• Conceptual Questions:– Questions 2-10 and 17-21
• Groups of three:– “Concept artist” to draw fields– “Recorder” to record answer & explanation– “Reporter” to report findings at the end of class
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Applications of Magnetic Fields
The Mass Spectrometer
Velocity Selectors / CRTs
Magnetic Levity
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Motion in a Magnetic Field
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Helical Motion in a Magnetic Field
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Uranium Separation Using a Mass Spectrometer
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Velocity Selectors
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Cathode Ray Tube
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Magnetic Levity
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Magnetic Trains