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Spinning Silver Egg

Electromagnetism

★Exhibit Content: Electromagnetic Induction ★Interaction: Mechanical Interaction ★Operation: Turn the handle and see how the silver egg changes. ★Exhibit Description: This exhibit mainly consists of three rotatable magnets, a metal egg, and a transparent disc. The three magnets are placed below the disc at 120-degree angles to each other. For easy viewing, the disc is made of transparent material. The metal egg is placed on top of the disc. To prevent visitors from touching the exhibit, it is covered with an acrylic cover. ★Scientific Principle: When visitors turn the handle, the magnets rotate to generate a rotating magnetic field. A set of permanent magnets is placed below the metal egg. Rotating the handwheel changes the magnetic field direction constantly, so this set of magnets can generate a rotating magnetic field. Since the metal 'egg' is a closed conductor, induced current is generated under the rotating magnetic field, forming a magnetic field. The interaction between the two magnetic fields makes the metal 'egg' rotate. Moreover, when the rotational kinetic energy remains constant, the smaller the moment of inertia, the higher the rotational speed. Athletes pull their bodies tight to minimize their moment of inertia. The golden egg, like a figure skater, stands up; with a smaller moment of inertia, it rotates more easily.

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Principle Display: ★★★★ Interaction Effect: ★★★★★ Ease of Installation: ★★★★★ Durability: ★★★★ Overall Rating: ★★★★★

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