Mid-Term_Exam_Solutions_Spring2011

# Mid-Term_Exam_Solutions_Spring2011 - Mid-Term Exam Graduate...

This preview shows pages 1–3. Sign up to view the full content.

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 6. Where might we find a wave E = E 0 e - αx e -i ωt , (here E 0 does not depend on x or t , but may depend on other things, and α is a non-zero real number)? 7. What happens to traveling waves incident on a plasma above the plasma frequency?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern