Explore the relationship between electricity and magnetism by building a homopolar motor. The Lorentz Force causes the wire to spin because of the magnetic fields of the permanent rare earth magnet and the wire carrying the electrical current. This fun science project is great for STEM education and learning.
▶️ Find homopolar motor experiment supplies:
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▶️ How to make a homopolar motor:
Step 1: Measure a section of magnet wire, but how much really depends on your design.
Step 2: Sand off the insulated coating anywhere the wire will be making a connection with the battery. This first design, where the wire is coiled around the battery, will only make connections at the two far ends of the wire, so that's where you need to sand.
Step 3: Attach rare earth magnets to the bottom of the battery.
And now comes a really hard part-
Step 4: As you make the connections with the two ends of your wire, you have to bend it really carefully so that as it spins, it doesn't fall off the battery, or come away from the neodymium magnet.
❗️ This process can take a really long time. Just keep bending the wire a little bit and testing it out on the battery, and bending a little more and testing it again. For some designs, it might take you an hour to get it just right. And because this battery is basically running on a short circuit, it will get hot after a few minutes so don't leave it running.
▶️ How the homopolar motor works:
Electrons traveling through the wire create a magnetic field, and that magnetic field interacts with the magnetic field of the permanent magnet, kind of like two permanent magnets attracting each other or repelling each other, and our homopolar motor. This force is called the Lorentz force.
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27 окт 2024
