28 EBWaveProperties

28 EBWaveProperties - Summary Lecture 27 changing E-field...

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Craig Ogilvie 11 Summary Lecture 27 § changing E-field induces B-field, change in B-field induces E-field, …. . § self-sustaining, propagating wave of E, B-fields § Proposed form of E/B wave § Substituted into Maxwell Equations § E/B waves satisfy equations only if E field perpendicular to B-field ratio of magnitudes of E-field / B-field = c wave propagates at speed of light B E n propagatio z wt kx B B y wt kx E E m m × = - = - = ˆ ) sin( ˆ ) sin( 1 0 0 ε μ = c x y z
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Craig Ogilvie 22 Goal Today § Explore properties of this E/B wave Wavelength, frequency…. energy propagation polarization
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Craig Ogilvie 33 Question: Direction (II), 1st round § B-field shown at a point in space and time for an electromagnetic wave that travels in the -ve x direction § What is the direction of the E-field at this point and time 1) 2) 3) 4) 5) B 1. 1 2. 2 3. 3 4. 4 5. 1 of 300
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Craig Ogilvie 44 Question: Direction (II), 2nd round 0% 0% 100% 0% 0% 0% 0% 100% 0% 0% 1 2 3 4 5 § B-field shown at a point in space and time for an electromagnetic wave that travels in the -ve x direction § What is the direction of the E-field at this point and time 1) 2) 3) 4) 5) B 1.
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28 EBWaveProperties - Summary Lecture 27 changing E-field...

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