Lecture_13 - Lecture 13-1 Lecture Physics 219 Question 1...

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Lecture 13 Lecture 13 -1 Physics 219 – Question 1 Feb. 28, 2011. An electromagnetic wave is traveling in +x direction and the electric field at a particular point on the x- axis points in the +z direction at a certain instant in time. At this same point and instant, what is the direction of the magnetic field? a) z b) x c) y d) +y e) None of the above
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Lecture 13 Lecture 13 -2 Energy Density of Electromagnetic Waves Electromagnetic waves contain energy. We know already expressions for the energy density stored in E and B fields: 2 0 1 , 2 E uE ε = 2 0 1 2 B B u μ = EM wave / / mm BE c c = = 2 2 0 2 0 1 22 E uu E c == = So Total energy density is 0 0 2 2 0 00 EB B E uB c E =+= = = = 2 2 0 0 2 2 0 0 rms rms B B E ∴= =
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Lecture 13 Lecture 13 -3 Energy Propagation in Electromagnetic Waves Energy flux density Intensity I P uc A == = Energy transmitted through unit time per unit area = Average energy flux density (W/m 2 ) 2 () 4 s P Ir r π =
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Lecture 13 Lecture 13 -4 Polarization of Electromagnetic Waves
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This note was uploaded on 04/23/2011 for the course PHYS 219 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture_13 - Lecture 13-1 Lecture Physics 219 Question 1...

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