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Demonstration experiment on Lenz law using alnico and coins

YANG Chun-ye1, LIU Gui-xing2(1. Shanghai Fuxing High School, Shanghai 200434, China;2. Department of Physics, Fudan University, Shanghai 200433, China)  
Simple magnetism demonstration experiments using alnico and lauminium coin are designed. The active force that alnico adds on coins made from aluminum-magnesium alloy is analyzed. These demonstration experiments can help students to understand the Lenz law.
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