In this video, it is completely explained that what is the purpose of that cylinder shaped thing in our charger leads and specially in laptop chargers.
This is actually a FERRITE bead which is also knows as FERRITE CORE or CHOKE, because it acts like an inductor and absorbs all the unwanted electrical signals and give the purified signal at the output.
It is made up of FERRITE CORE and rounded by wires in order to ground the unwanted frequencies, that may interfere in the working of any electronic device or equipment.
These ferrite beads are most commonly use in medical equipments in order to absorb or neglect the radio frequencies that are present every time in the air.
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