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Iron-Nail Bridge

Electromagnetism

★Exhibit Content: Magnetization phenomenon ★Interaction: Mechanical interaction ★Operation: Operation: 1. Press the "Power On" button, and the timer starts counting; 2. Within the specified time, use small iron nails to connect the left and right "bridge piers" to build the "bridge deck"; 3. Press the "Power Off" button and observe the phenomenon. ★Exhibit Description: The exhibit consists of two bridge piers made of electromagnets and several iron nails. When the visitor presses the power-on button, the digital display starts counting down. The visitor must complete the bridge deck connection with iron nails within the set time. When time is up, the electromagnet automatically powers off. The electromagnet can also be directly turned off using the power-off button. ★Scientific Principle: Why can small iron nails attract each other to form a "bridge deck"? The "bridge piers" on both sides are iron cores with coils wound around them, i.e., electromagnets. When power is off, the "bridge piers" have no magnetism, but when the coil is energized, the iron core in the middle becomes magnetic. At this time, when the small iron nails approach the "bridge piers", they are attracted and also become magnetic. Because magnets have the characteristics of like poles repelling and opposite poles attracting, the iron nails can connect end-to-end between the two "bridge piers" to form a "bridge deck". The phenomenon in which these originally non-magnetic iron cores and iron nails exhibit magnetism under the action of a magnetic field is called magnetization.

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

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