This small experiment is one of the most interesting small productions in the second physical circuit diagram, and the experimental materials are easy to find.
Use a nail, a battery, a wire, a button magnet (recommended to use the neodymium magnet on the headset, 30 seconds to make the world's simplest motor.
First connect the nail to the magnet and suck it on one pole of the battery. Both positive and negative can be used, but the last method of rotation is the opposite. Then use the wire to connect the battery to the magnet of the tail section of the nail, that is, slowly touch the magnet with the wire, and the nail will start to accelerate. According to the measurement, it takes only 15 seconds to accelerate the nail to 10,000 rpm! (It is recommended to place it vertically, it is recommended that the magnet be larger, and the weight can offset the magnetic force to minimize the friction between the nail and the battery contact point).
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