chap250 - 1 PHYS 1302 Introductory General Physics II...

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Unformatted text preview: 1 PHYS 1302 Introductory General Physics II Chapter 25: Electromagnetic Waves 7/21/09 LAU/PHYS 1302 Chapter 25 12-2 Electromagnetic waves s Electromagnetic (EM) waves are oscillations of electric and magnetic fields. s EM waves were predicted by Maxwell based on the laws of electromagnetism (Coulomb, Ampere, Faraday) and the deduction from these laws that changing electric field produces a magnetic field. s EM waves were observed experimentally first by Hertz and Marconi circa 1890. s EM waves can propagate in vacuum without the presence of matter without attenuation. 7/21/09 LAU/PHYS 1302 Chapter 25 12-3 Laws leading to Electromagnetic waves s Faraday Law: changing magnetic field produces electric field s Maxwells equation: changing electric field, having the same effect as a steady current (Amperes Law), can also produce a magnetic field B V E t = = = - l 2 1 E B t c = l 2 1 c = 7/21/09 LAU/PHYS 1302 Chapter 25 12-4 Producing an EM wave by an antenna 7/21/09 LAU/PHYS 1302 Chapter 25 12-5 Snapshots of the production of an Electromagnetic Wave 7/21/09 LAU/PHYS 1302 Chapter 25 12-6 Right hand rule for EM waves 7/21/09...
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chap250 - 1 PHYS 1302 Introductory General Physics II...

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