What is the Cylindrical thing at the end of Your Laptop Charger?

Have you ever wondered what is that

cylindrical thing at the end of your laptop

chargers? Most of us think that it is useless But it's NOT! Today we are going to reveal importance of it.

We all know that electrical current passes

through a charging cable in order to power

up any device battery. Due to this electric

current in the cable, it creates radio energy

within itself and emits this signal(radio

energy) in the form of waves outside the

cable In simple words, the charger acts like an antenna.

These signals (waves) can interfere with

our nearby devices like smartphones/

radios/ TVs components of laptop and

can cause problems. Here's where the

magical cylinder comes into the role.

It is known as ferrite beads. Their goal in life is to eliminate(block) those interference signals/ noise. This helps to isolatea laptop from other signals and radio energy.