Electromagnet with Rod - 搜索图片

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wiseGEEK
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Simple Electromagnet With Switch
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Electromagnet How To Make Stronger

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Magnetic Rod & Its Applications | Stanford Magnets
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kenenghardware.com
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YouTube > Vipin Chauhan
Make a Electromagnet using a nail and battery DIY
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Exploratorium
Magnetic Suction: Magnetism & Electricity Science Activit…

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