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Unformatted text preview: WebAssign Ch24 HW1 S2010 (Homework) Kiyaniah Tilghman PY 208, section 003M, Spring 2010 Instructor: Keith Weninger Current Score : 5 / 10 Due : Wednesday, April 21, 2010 02:36 PM EDT About this Assignment Extension Requests Question Points 12345 22132 Total 5/10 (50.0%) Description Electromagnetic radiation Instructions Reading: Sec. 24.1-24.2 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. 2/2 points All Submissions Notes Question: MI3 24.X.024 At a time t 0 an electric field is detected in the region shown on the left diagram. The electric field is zero at all other locations. At a later time t 1 an electric field is detected in the region shown on the right diagram; the electric field is zero elsewhere. You conclude that an electromagnetic wave is passing through the region. (a) What is the direction of propagation of the electromagnetic wave? -x -x (b) If you were to measure the magnetic field in the region where the electric field is nonzero, what would be the direction of the magnetic field? - z (into page) - z (into page) Solution or Explanation (b) The direction of propagation is in the direction of . 2. 2/2 points All Submissions Notes Question: MI3 24.X.025 A pulse of electromagnetic radiation is propagating in the +y direction. You have two devices that can detect electric and magnetic fields. You place detector #1 at location < 0, - 3, 0> m and detector #2 at location < 0, 3, 0> m. (a) At time t = 0, detector #1 detects an electric field in the - x direction. At that instant, what is the direction of the magnetic field at the location of detector #1? +z +z (b) At what time will detector #2 detect electric and magnetic fields? t = 2e-8 2.00e-08 s 3. 1/1 points All Submissions Notes Question: MI3 24.X.001 If the magnetic field in a particular pulse has a magnitude of 2 10-5 tesla (comparable to the Earth's magnetic field), what is the magnitude of the associated electric field? 6000 6000 V/m 4. 3/3 points All Submissions Notes Question: MI3 24.X.026 =< A pulse of radiation propagates with velocity = < 0, 0, ! c >. The electric field in the pulse is 9.1 106 , 0, 0 > N/C. What is the magnetic field in the pulse? <0 0 , - .0303 - 0.0303 , 0 0 >T 5. 2/2 points All Submissions Notes Question: MI3 24.X.023 Electromagnetic radiation is moving to the right, and at this time and place the electric field is horizontal and points out of the page (see the figure). The magnitude of the electric field is E = 3300 N/C. What is the magnitude of the associated magnetic field at this time and place? B = 1.1e-5 1.1e-05 T What is the direction of the associated magnetic field at this time and place? e e ...
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This note was uploaded on 09/21/2010 for the course PY 005 taught by Professor Mattewk. during the Spring '10 term at N.C. State.
- Spring '10