PHYS4210 Quiz: Electromagnetic Theory - Prof. James J. Napolitano, Quizzes of Physics

Download PHYS4210 Quiz: Electromagnetic Theory - Prof. James J. Napolitano and more Quizzes Physics in PDF only on Docsity! Name: PHYS4210 Electromagnetic Theory Quiz 12 April 2010 This is a closed book quiz! Write the best choice in the space next to the question. 1. Given a four-vector potential Aµ = (0,−Kct, 0, 0) where K is a constant ant t is time, what are the electric and magnetic fields? A. E = B = 0 B. E = B = Kx̂ C. E = 0 and B = Kx̂ D. E = Kx̂ and B = 0 E. E = Kx̂ and B = Kŷ 2. Which of the following describes an electromagnetic wave with “x” polarization and traveling in the +z direction? (Assume k > 0.) A. E0x̂ exp(−i(ωt− kz)) B. E0x̂ exp(−i(ωt+ kz)) C. E0ẑ exp(−i(ωt− kx)) D. E0ẑ exp(−i(ωt+ kx)) E. E0ŷ exp(−i(ωt− kz)) 3. The (phase) velocity of an electromagnetic wave moving through a medium with dielectric constant ε and magnetic permittivity µ is A. c B. cεµ C. c/εµ D. c √ εµ E. c/ √ εµ