{"id":55918,"date":"2025-11-15T04:43:53","date_gmt":"2025-11-14T19:43:53","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=55918"},"modified":"2025-11-15T04:43:53","modified_gmt":"2025-11-14T19:43:53","slug":"wireless-wonders-experience-the-invisible-force-of-faradays-induction","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=55918&lang=en","title":{"rendered":"Wireless Wonders: Experience the ‘Invisible Force’ of Faraday’s Induction"},"content":{"rendered":"

I’m Ken Kuwako, a science trainer. Every day is an experiment.<\/strong><\/span><\/p>\n

You can charge your smartphone just by placing it on a charging pad. You can pass through a ticket gate simply by tapping an IC card. Isn’t that amazing?<\/p>\n

All of these rely on technology that transmits electricity or information without a physical cord. Most of them are based on the scientific principle of “Electromagnetic Induction,” discovered by Faraday in the 19th century.<\/p>\n

Today, I’d like to introduce a fascinating experimental kit that lets you visibly experience this “hand-off of an invisible force”: the Otona no Kagaku Magazine Plus Electromagnetic Experiment Speaker.<\/p>\n

The “Invisible Force” that Lights Up a Floating Sphere<\/h3>\n

This is the experimental kit. It consists of a green ring and a mysterious sphere floating in the water.<\/p>\n

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Otona no Kagaku Magazine Plus Electromagnetic Experiment Speaker<\/a><\/p><\/div>\n

The floating, glowing sphere contains an LED, a coil, and a capacitor circuit.<\/p>\n

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Here’s how it works. First, an electric current flows from the battery into the coil inside the surrounding green ring (the transmitting side). This creates a “magnetic field” (the space where magnetic force acts) around the green ring.<\/p>\n

This magnetic field passes through the coil inside the floating sphere (the receiving side), crossing the space between them.<\/p>\n

The electricity used here is called “alternating current” (AC), which constantly changes its direction and strength. Because of this, the generated magnetic field also changes moment by moment.<\/p>\n

And here is the climax of the science: when the magnetic field passing through the coil changes, electricity flows through that coil! This is the essence of Electromagnetic Induction. It’s this induction that allows current to flow to the LED inside the sphere, making it glow without any wires.<\/p>\n

Isn’t it fascinating how an invisible magnetic field delivers electricity almost like magic? Be sure to watch the video!<\/p>\n