ch-22-gian - CHAPTER 22 ELECTROMAGNETIC WAVES If you need...

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Unformatted text preview: CHAPTER 22 ELECTROMAGNETIC WAVES If you need notes of this chapter please e-mail me Suggested problems from this chapter =1, 3, 4, 5, 6, 7, 8, 9 11, 12, 15 TOPICS OF INTEREST Production of Electromagnetic Waves The Spectrum of EM Waves The Speed of EM Waves The Energy of EM Waves Production of Electromagnetic Waves lectromagnetic waves are produced when electric charges re accelerated. In other words, a charge must radiate energy hen it undergoes acceleration. Radiation cannot be roduced by stationary charges or steady currents . Electric field lines of an oscillating point charge Production of Electromagnetic Waves Effect of a DC current source – No EM waves Production of Electromagnetic Waves roduction of EM Waves Let's assume we have an antenna, which is just some kind of ire that is connected to an ac source. The ac source produces scillating + and - charges which set up electric field (due to the separation of charge) and a magnetic field (due to the current in the wire). Note that the electric and magnetic fields are perpendicular to each other. This field begins to move away from the antenna and in a little while the ac source has caused the situation to reverse . E B e have a magnetic field that is oscillating in and out of the paper nd an electric field that is oscillating up and down in the aper. Since a changing magnetic field creates an electric field nd a changing electric field creates a magnetic field, these two...
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This note was uploaded on 05/07/2008 for the course ARCH 2023 taught by Professor Joshi during the Spring '08 term at Arkansas.

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ch-22-gian - CHAPTER 22 ELECTROMAGNETIC WAVES If you need...

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