2015 BFY II Abstract Detail Page

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Abstract Title: W41 - Magnetic Torque
Abstract: In Magnetic Torque, a snooker ball with an imbedded magnetic dipole floats on an air bearing in the uniform field of Helmholtz like coils.  The magnetic moment of the dipole can be found five independent ways using a wide variety of E&M and mechanics concepts.  The choices made and limitations imposed in each of the measurements can motivate interesting discussions about accuracy and precision.  As importantly, these experiments lead to a sense of the magnetic moment as a quantity in itself and not just an effect emanating from a current carrying loop.
In addition, we will verify that the slope of the line relating precession frequency to magnetic field is indeed the gyromagnetic ratio and go on to demonstrate a classical analog of magnetic resonance including a hand-powered pulsed NMR spin-flip.  (This capability is not only particularly satisfying for pre-meds, biophysicists, and physical chemists, but also very comforting for anyone who has had or will have an MRI!)

Participants will:
• Demonstrate the difference between magnetic torque and magnetic force
• Make several basic measurements to get a 'ball-park' sense of the possibilities of each measurement technique
• Create a classical NMR spin-flip with their own two hands
Abstract Type: Workshop

Author/Organizer Information

Primary Contact: Barbara Wolff-Reichert
and Co-Presenter(s)
Jonathan Reichert, George Herold, David Van Baak, TeachSpin

Workshop Documents

Workshop Doc 1: Download the Workshop Doc 1
Workshop Doc 2: Download the Workshop Doc 2
Workshop Doc 3: Download the Workshop Doc 3