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Mid-Term_Exam_Spring2011 - Mid-Term Exam Graduate...

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Mid-Term Exam: Graduate Electromagnetics II, 95.658 Spring 2011, UMass Lowell, Dr. Baird Part I: Multiple Choice (60 Points) Circle the one best answer to each question. 1. What is the wave E = E 0 sin( kx )e - t/τ e -i ωt ? (a) a traveling wave decaying in time (b) a traveling wave packet (c) a standing wave decaying in time (d) a traveling wave decaying in space 2. What does “normal dispersion” describe? 3. Which is not a valid description of a circularly polarized plane wave? 4. What is the phase difference between the magnetic field and the electric field in a radiated wave? 5. When might the electric field and magnetic field in a wave not be perpendicular to k ? (a) in a waveguide (b) in free space (c) they are always perpendicular to k (d) they are never perpendicular to k
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