Well we have  have  been using laptops so many years  and that to for years and yes we have a basic idea of all those wires going in and out from the laptop and its charger. But here is one thing that I am sure not much of you have noticed the small cylinder. Yes now remember. But have you ever thought that this is for.

Well sor so many years we have been using laptops but none of us know the reason. You will not only find this bead at end of charging cables but also mouse, keyboard and other peripheral cables.

Well this cylinder is called a ferrite bead or, more generically, a choke.

But what  it is for………. So here is the answer

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