PHYS4210 Electromagnetic Theory Quiz #13 - Prof. James J. Napolitano, Quizzes of Physics

Download PHYS4210 Electromagnetic Theory Quiz #13 - Prof. James J. Napolitano and more Quizzes Physics in PDF only on Docsity! Name: PHYS4210 Electromagnetic Theory Quiz #13 9 May 2011 This is a closed book quiz! You have thirty minutes to complete it. Write the best choice in the space next to the question. 1. A single charged particle undergoes simple harmonic motion with angular fre- quency ω. The average radiated power is proportional to A. ω0 B. ω1 C. ω2 D. ω3 E. ω4 2. An electric dipole is formed from two stationary charges ±q separated by a fixed distance b. For large distances r  b from the dipole, the electric field falls like A. 1/r B. 1/r2 C. 1/r3 D. 1/r4 E. 1/r5 3. A long, thin, cylindrical rod of length d and radius R, with d  R, sits in an external, uniform magnetic field B whose direction is aligned with the axis of the rod. If the rod is made of a homogenous material with magnetic permittivity µ, what is the magnitude of the magnetic field inside the rod? A. B B. µB C. B/µ D. (R/d)µB E. (R/d)B/µ 4. Given a four-vector potential Aµ = (0,−Kct, 0, 0) where K is a constant and 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