Difference: MagneticTorqueLab (2 vs. 3)

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META TOPICPARENT	name="PHY4821L"

-- JorgeRodriguez - 2012-01-13

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The goal here is measure the magnetic moment of the magnetized disk at the center of the snooker ball. Instructions on how to perform the measurements are available from the teachspin website http://www.teachspin.com/instruments/magnetic_torque/index.shtml

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First measure the magnetic moment via the gravitational torque method. The torque exerted by the gravitational field on a rod with a sliding weight is compared to the magnetic torque due to the disk inside the ball.
Use the harmonic oscillation of the magnetized ball/disk system to determine the magnetic moment
Use the precessional motion of the spinning magnetized/ball disk system to determine the magnetic moment

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First measure the magnetic moment via the gravitational torque method. The torque exerted by the gravitational field on a rod with a sliding weight is compared to the magnetic torque due to the disk inside the ball. Plot your data, with error bars, and then fit to a straight line. Determine the slope of the line and its error from the fit. Use the slope to determine the magnetic moment and its uncertainty. How is this better than just averaging the results?
Use the harmonic oscillation of the magnetized ball/disk system to determine the magnetic moment. Again fit your data to a straight line.
Use the precessional motion of the spinning magnetized/ball disk system to determine the magnetic moment. Make sure you understand how this method works. It may be helpful to go back to your physics 1 text book to review how the dynamics of rotational systems work in the context of angular moment conservation. With this you'll final understand why you don't fall off a bicycle when its rolling.

In all of the measurements above determine your errors carefully, both systematic and statistical (if you take repeated measurements) and include these in your results for each method.

Assignment: 2 Combine all three measurements

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