{"id":55743,"date":"2025-11-11T04:59:12","date_gmt":"2025-11-10T19:59:12","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=55743"},"modified":"2026-09-25T04:24:14","modified_gmt":"2026-09-24T19:24:14","slug":"the-dancing-magnet-how-to-listen-to-ac-currents-secret-sound","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=55743&lang=en","title":{"rendered":"Magnets Dance in a Paper Cup! Discover How Speakers Work with a Homemade Wire"},"content":{"rendered":"

I\u2019m Ken Kuwako, a Science Trainer. Every day is an experiment.<\/b><\/span><\/p>\n

\u201cAn invisible magnetic field carrying sound through the air.\u201d<\/p>\n

Have you ever experienced something that felt almost like magic?<\/p>\n

The other day, while visiting the science museum Tsukuba EXPO Center, I came across an exhibit that made me stop in my tracks. It was a fascinating speaker that used a coil. Simply holding the coil-equipped speaker in the invisible magnetic field coming from the base allowed you to hear sound through electromagnetic induction.<\/p>\n

\"\"<\/p>\n

Move it farther away, and the sound becomes faint. Bring it closer, and the sound suddenly gets much louder. We may understand in theory that a magnetic field can generate an electric current across empty space, but actually experiencing it is so fascinating that you can\u2019t help saying, \u201cWow!\u201d<\/p>\n

This time, I\u2019d like to show you how to recreate this \u201celectricity jumping through space\u201d at home. The star of the show is a homemade magic wire called the Pascal Wire<\/b>, which you can make with materials from a dollar store and a little ingenuity.<\/p>\n

1\u672c\u306710\u672c\u5206!?\u300c30\u30a2\u30f3\u30da\u30a2\u7d1a\u300d\u306e\u78c1\u5834\u3092\u4f53\u9a13\u3067\u304d\u308b\u30d1\u30b9\u30ab\u30eb\u96fb\u7dda\uff08S-cable\uff09<\/a><\/p><\/blockquote>\n