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The Invisible Force

Mobile Science Museum · Electromagnetism

Operation: Press the operation button and carefully observe the movement and changes of the metal ring. Function Overview: The exhibit consists of an electromagnetic coil, a metal ring, a control system, etc. When the operation button is pressed, the metal ring jumps up rapidly, demonstrating the principle of Lenz's Law. Scientific Principle: When alternating current passes through the coil, the coil generates an alternating magnetic field, and the aluminum ring generates a reverse eddy current and a corresponding magnetic field. The two magnetic fields are in opposite directions, causing the aluminum ring to jump up. Think about it: can the aluminum ring levitate if direct current is used?

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