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Cable Cord Cylinders:-

Have you ever taken the time of the day to figure out what the cylinder-like lump at the end of the cord is? They are actually known as ferrite cores or chokes. They have magnetic iron oxide, which helps prevent high-frequency electromagnetic interference. If your phone is a little too close to your speaker, weird noses might interrupt the call. The big cylinders on those cable cords prevent such interruptions.

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