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sp08final - Name Instructor Louisiana State University...

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Name: _______________________ Instructor:__________________ Louisiana State University Physics 2102, Final Exam, May 9, 2008. Please be sure to write your name and class instructor above. The test consists of 6 questions (conceptual), and 6 problems (numerical). For the problems: Show your reasoning and your work. Note that in many of the problems, you can do parts (b) and (c) even if you get stuck on (a) or (b). You may use scientific or graphing calculators, but you must derive and explain your answer fully on paper so we can grade your work. Feel free to detach, use, and keep the formula sheet pages. No other reference material is allowed during the exam. Good Luck!
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Question 1 [12 points] The figure below shows a parallel-plate capacitor and the current in the connecting wires that is discharging the capacitor. (i) What is the direction of the electric field between the plates? (a) Toward the left (b) Toward the right (c) Upward (d) Downward (ii) What is the direction of the displacement current? (a) Toward the left (b) Toward the right (c) Upward (d) Downward (iii) What is the direction of the magnetic field at point P? (a) Upward (b) Downward (c) Into the page (d) Out of the page
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Problem 1 [22 points] A plane electromagnetic wave propagates in the +y direction. The magnetic field associated with the wave oscillates in the x direction, and has a peak magnitude of 3.6 x 10 -8 T? The frequency of the wave is 3.902 MHz. (a) (3 pts) In which direction does the electric field oscillate? (b) (3 pts) In which direction does the Poynting vector point? (c) (3 pts) Calculate the peak magnitude of the electric field: (d) (3 pts) Calculate the wavelength of the wave: (e) (5 pts) Calculate the peak magnitude of the Poynting vector: (f) (5 pts) Calculate the time averaged rate of flow of energy (in W/m 2 ):
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