Q. Which of the following statements is/are true about Electromagnetic Field(EMF)?
1.Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
2.These fields are produced only by natural sources.
3.Electromagnetic fields are present everywhere in the environment.
Select the correct answer using the codes given below;
Electromagnetic fields are a combination of invisible electric and magnetic fields of force.
Electromagnetic fields are present everywhere in the environment but are invisible to the human eye.
Natural Sources: Electric fields are produced by the local build-up of electric charges in the atmosphere associated with thunderstorms. The earth’s magnetic field causes a compass needle to orient in a North-South direction and is used by birds and fish for navigation.
Human-made sources: It includes medical equipment using static fields (e.g. MRI), electric appliances using low frequency electric and magnetic fields (50/60 Hz), and various wireless, telecommunications and broadcasting equipment using high radio frequency electromagnetic fields.
Source: PIB
