Everybody knows that magnets are fun. You can build all kinds of amazing toys with them. These electromagnetic ball accelerators rely on electromagnetic coils and sensors to keep metal balls accelerating on your desk. They use infrared sensors to detect the balls as they reach one end. The coils create a magnetic field that repel the ball to accelerate it towards the opposite coil.
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2 Electromagnetic "Perpetual Motion" Ball Accelerators Compared ⭐ Gadgetify
This video shows a linear and circular ball accelerator. The circular ones are available with 2, 4, 6 and more coils. They are great for demonstrating physics concepts but also make a fun desk toy. You are going to need a complete flat surface for these to work. The circular ball accelerator can get multiple balls moving as long as you get the timing right.
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