EM WAVES Lecture Notes 1 ELECTROMAGNETIC WAVES Radio, TV, radar waves, infrared, light, ultraviolet rays, X-rays, gamma rays are all electromagnetic waves 1. Source and generation ? All EM waves are produced by accelerating charges Demo: Field from accelerating charge (Phy Java App) Formulas are: Changing magnetic field produces electric field ( )around a loop ? (Faraday's law)BE l t ?? = ? Changing electric field produce magnetic field ( ) 0 0around a loop ? (Ampere's law)EB l t? ? ?? = ? Combining these two equations mathematically Maxwell predicted that: ?Electric and magnetic fields can propagate (in vacuum) {Maxwell did not predict vacuum propagation, he assumed ether} oscillating and producing each other. This moving oscillating fields