Device for Exploring Eddy Currents and Magnetic Damping
A common physics demonstration device for exploring eddy currents and magnetic damping. (a) The motion of a metal pendulum bob swinging between the poles of a magnet is quickly damped by the action of eddy currents. (b) There is little effect on the motion of a slotted metal bob, implying that eddy currents are made less effective. (c) There is also no magnetic damping on a nonconducting bob, since the eddy currents are extremely small.
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"OpenStax College, Eddy Currents and Magnetic Damping. February 8, 2013."
http://cnx.org/content/m42404/latest/
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