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In equal-arm balances from the early twentieth century, it is sometimes observed that an aluminum sheet hangs from one of the arms and passes between the poles of a magnet. This causes the oscillations of the equal-arm balance to decay rapidly. In the absence of such magnetic braking, the oscillation might continue for a very long time, so that the experimenter would have to wait to take a reading. The oscillations decay because which of the following reasons? A. Aluminum is paramagnetic. B. Currents in the aluminum sheet set up a magnetic field that opposes the oscillations. C. The aluminum sheet is attracted to the magnet.
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In equal-arm balances from the early twentieth century, it is sometimes observed that an aluminum sh...
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