One ring is spit and the other is solid. Oscillate the bar magnet in and out of the ring and try to cause them to oscillate. The split ring will not move, as there is no current circulating through it. The solid ring becomes an electromagnet whose field opposes a change in the field due to the moving magnet, which results in the ring oscillating.
(5H40.32) Magnetic Force on Metal Rings
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One ring is spit and the other is solid. Oscillate the bar magnet in and out of the ring and try to cause them to oscillate. The split ring will not move, as there is no current circulating through it. The solid ring becomes an electromagnet whose field opposes a change in the field due to the moving magnet, which results in the ring oscillating.
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