Why electronic equipments get damaged in electro magnetic field?

Answer 1

Answer:

a changing magnetic field results in an emf, and that is basically the principal of electromagnetic induction. This means that if you pass a magnetic field across a conductor, it will induce a current in that conductor.

A piece of electronics is often a semiconductor that is designed to have an exact amount of current flowing through it, and no more.

If you pass a magnetic field near the semi-conductor, it may induce a current in that conductor greater that the maximum that the device was designed for, and this could result in that devices break down.

The same is true of hard disk drives, accept in the case of a hard drive (magnetic storage), the device uses magnetic media to store information, and passing a magnet near it will erase the information.

A common place for magnets to be found is in speaks systems.