Iron Filings On a Bar Magney - 搜索图片

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Iron filings attracted to a bar magnet - Stock Video Footage - Dissolve
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youtube.com > Physics with Simon Poliakoff
Iron filings to show magnetic field around a bar magnet
YouTube · Physics with Simon Poliakoff · 4633 次播放 · 2021年3月3日

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The Meaning of Pull and How to Create It - High Velocity Innovation

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