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传统的小磁块在铝管中下落的电磁阻尼演示实验简单、方便,但却存在落体不可见和在下落过程中摩擦力的影响不可忽略等缺陷。为此,必须转换实验思路,让质量较大的柱形永磁体固定在透明的玻璃管内,而让质量轻得多的铝环充当落体,并每隔一段距离固定一个钕铁硼材料的柱形强磁体。改进后的电磁阻尼实验滞后现象明显,演示效果佳。
The traditional small magnet block in the aluminum tube drop in the electromagnetic damping demonstration experiment is simple and convenient, but there is the fall is not visible and in the process of falling friction can not be ignored and other defects. To this end, we must convert the experimental ideas, so that the larger mass of cylindrical permanent magnet fixed in a transparent glass tube, and let much lighter mass of aluminum ring as the role of the body and at fixed intervals from one cylindrical NdFeB material Strong magnet. After the improvement of the electromagnetic damping experiment obvious hysteresis, demonstration effect is good.