Question

What is the best way to protect an electronic device, which can be destroyed by an

electric field of a lightning?

	A.	Place it in a glass jar
	B.	Place it in a solid metal box
	C.	Leave it open, but keep away from metal objects
	D.	Place it under a large tree

Answer 1

Correct option is B. Place it in a solid metal box.

The solid metal box will act like a Faraday cage. A faraday cage is a closed container made up of conducting material. It is a hollow conductor which can keep radiation and static charge on its boundary without any penetration inside it.  A Faraday cage functions by distributing the electric charge or radiation around the exterior of the cage. This rearrangement of the charges leads to cancellation of radiation or charge within the interior of the cage. Thus, we get the electric field inside the conducting material to be zero and we can not have any electromagnetic radiation inside the conducting material. That is why if we keep electronic device inside a solid metal box, it will keep all the lightning falling on it to its outer surface and thus protecting the electronic device,