Electromagnetic Waves - UCF Physics

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Energy in <strong>Electromagnetic</strong> <strong>Waves</strong> • Electric and magnetic fields contain energy. Potential energy stored in the field: u E and u B u E : ½ ε 0 E 2 electric field energy density u B : (1/μ 0 ) B 2 magnetic field energy density • The energy is put into the oscillating fields by the sources that generate them. • This energy can then propagate to locations far away, at the velocity of light.
The Poynting Vector In general, we find: S = (1/μ 0 )Ex B S is a vector that points in the direction of propagation of the wave and represents the rate of energy flow per unit area. We call this the “Poynting vector”. S dx area A B E propagation direction Units of S are Jm -2 s -1 , or Watts/m 2 .
Page 1 and 2: Sinusoidal Function of Distance A s
Page 3 and 4: • Use of a rotating vector to gen
Page 5 and 6: F(x) λ x Static wave F(x) = F P si
Page 7 and 8: Plane Electromagnetic Waves E y B z
Page 9 and 10: Maxwell’s Equations of Electromag
Page 11: Plane Electromagnetic Waves E y B z
Page 15: Propagation of Electromagnetic Wave

Electromagnetic Waves - UCF Physics

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