RRB Paramedical Staff Nurse Model Paper 5

A time varying magnetic field is a source of changing electric field. And a time varying electric field is a source of changing magnetic field. These variations in electric field and magnetic fields occur in mutually perpendicular directions and have wave like properties. Maxwell was thus led to the idea that a wave of electric and magnetic fields both varying with space and time should exist, one providing the source of another. Such a wave is called electromagnetic wave.