Which type of material must be used for lightning rod?

Lightning rods are made from the metal rod that are attached to the roof of a building.

It was first discovered by Benjamin Franklin. The rod will have the diameter of 2cm which is connected to a piece of copper or aluminium wire.

The purpose of a lightning rod is that when lightning strikes, the rod makes sure to carry the electric current away from the structure and transfer it safely to the ground.

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