Homework #29

# Choose the unit vector corresponding to this

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Unformatted text preview: lanation: Based on the change in location of the electric ﬁeld between t0 and t1 , the electromag- 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? Choose the unit vector corresponding to this direction. 1. 1, 0, 0 2. 0, 1, 0 dedow (kfd235) – Ch24-h1 – turner – (56525) 3. −1, 0, 0 4. 0, 0, −1 5. 0, 0, 1 correct 6. 0, −1, 0 Explanation: The direction of propagation is in the direction of E × B , which is in the +y direction. Using the right-hand rule, B must be in the +z direction. 011 (part 2 of 2) 10.0 points At what time will detector 2 detect electric and magnetic ﬁelds? Remember that c = 3 × 108 m/s. Correct answer: 3.33333 × 10−8 s. The key to this problem is to begin by deciding the direction of the magnetic ﬁeld. Since the wave is propagating in the −z direction, and the electric ﬁeld is in the +x direction, the magnetic ﬁeld must be in...
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## This note was uploaded on 01/22/2014 for the course PHY 303L taught by Professor Turner during the Summer '08 term at University of Texas.

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