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p.1067
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Ch 34 Electromagnetic Waves34.1 Displacement Current and the General Form
of Ampere’s Law
Id = 0dE/dt B·ds = 0(I + Id)
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P34.1 (p.971)
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Ch 34 Electromagnetic Waves
34.2 Maxwell’s Equations
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Ch 34 Electromagnetic Waves
34.3 Plane Electromagnetic Waves
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Properties of EM Waves
1. Transverse
a. E and B propagation direction with
E B at all times
b. Propagation direction: E x B
2. Sinusoidal
a. Ey = Emaxcos(kx – t)
b. Bz = Bmaxcos(kx – t)
3. Emax/Bmax = E/B = c
4. c = (1/00)1/2
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P34.8 (p.971)
P34.9 (p.971)
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CT1: A planar electromagnetic wave is propagating through space. Its electric field vector is given by E = Emaxcos(kz – t) i. Its
magnetic field vector is
A. B = Bmaxcos(kz – t) j
B. B = Bmaxcos(ky – t) k
C. B = Bmaxcos(ky – t) i
D. B = Bmaxcos(kz – t) k
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Ch 34 Electromagnetic Waves
34.4 Energy Carried by Electromagnetic Waves
A. Poynting’s Vector
S = E x B / 0
Intensity = Power / Area = S
Propagation direction is the direction of S
B. Average Intensity
Iav = EmaxBmax/20
P34.16 (p.972)
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CT2: At a fixed point, P, the electric and magnetic field vectors in an electromagnetic wave oscillate at angular frequency . At what angular frequency does the Poynting vector oscillate at that point?
A. 2
B.
C. /2
D. 4
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Ch 34 Electromagnetic Waves
34.5 Momentum and Radiation Pressure
p = U/c (absorbed wave – normal incidence)
p = 2U/c (reflected wave – normal incidence)
Pressure = S/c (absorbed wave – normal incidence)
Pressure = 2S/c (reflected wave – normal incidence)
P34.33 (p.973)
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Ch 34 Electromagnetic Waves
34.7 The Spectrum of Electromagnetic Waves
Maxwell’s Rainbow: c = f
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CT3: A long wavelength EM wave has a
A. higher frequency than a short wavelength
EM wave
B. the same frequency as a short wavelength
EM wave
C. lower frequency than a short wavelength
EM wave
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Polling Question: Which material would you like to review most?
A. Exam 1
B. Exam 2
C. New Material
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Polling Question: Which chapters from the Exam 1 material would you like to review most?
A. 13
B. 23
C. 24
D. 25
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Polling Question: Which chapters from Exam 2 material would you like to review most?
A. 26
B. 27
C. 28
D. 29
E. 30
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Polling Question: Which chapters from the new material would you like to review most?
A. 31
B. 32
C. 33
D. 34
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Polling Question: Which type of material would you like to review most?
A. problems
B. concept questions
C. general principles