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

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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
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TOPICS OF INTEREST Production of Electromagnetic Waves The Spectrum of EM Waves The Speed of EM Waves The Energy of EM Waves
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Production of Electromagnetic Waves Electromagnetic waves are produced when electric charges are accelerated. In other words, a charge must radiate energy when it undergoes acceleration. Radiation cannot be produced by stationary charges or steady currents . Electric field lines of an oscillating point charge
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Production of Electromagnetic Waves
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Effect of a DC current source – No EM waves
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Production of Electromagnetic Waves
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Production of EM Waves Let's assume we have an antenna, which is just some kind of wire that is connected to an ac source. The ac source produces oscillating + 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 .
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E B We have a magnetic field that is oscillating in and out of the paper and an electric field that is oscillating up and down in the paper. Since a changing magnetic field creates an electric field
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