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$750
透明壓克力盤。
尺寸：200x 200x 10mm。
附件：磁鐵 1 支，U型磁鐵1個，鐵粉1瓶。
Demomstrates direction and force of the magnetic field around a bar and a U shape magnet. Includes 200 x 200 x 10mm acrylic viewing box with iron filings，a bar and a U shape magnet.
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