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直径Φ12mm长95mm强磁针，直径Φ12mm长95mm强磁棒 演示奥斯特实验，验证环形电流磁场方等实验，也可用于学生分组实验 strongmagneticrodwithΦ12mmand95mmlong strongbarmagnetneedleΦ12mmand95mmlong 1.UsestrongmagneticneedleorstrongmagneticrodwithΦ12mmdiameterand95mmlengthtodemonstrateOerstedexperiment 2.UseastrongbarmagnetwithdiameterΦ12mmand95mmlengthtodemonstratethemagneticfielddirectionofringcurrent有关演示视频请参阅网址www.mzhsx.com