Quiz 17 for Electromagnetic Theory | PHYS 4210, Quizzes of Physics

Download Quiz 17 for Electromagnetic Theory | PHYS 4210 and more Quizzes Physics in PDF only on Docsity! Name: PHYS4210 Electromagnetic Theory Quiz 17 Feb 2009 This is a closed book quiz! Write the best choice in the space next to the question. 1. An azimuthally symmetric, localized charge distribution has no net charge, zero dipole moment, but a nonzero quadrupole moment. At a large distance r from the distribution, the electric potential φ(r, θ) falls like A. 1/r B. 1/r2 C. 1/r3 D. 1/r4 E. 1/r8 2. A spherical conducting shell of inner radius a and outer radius b carries carries a net charge Q. The electric potential as a function of the radius r, for a ≤ r ≤ b is A. 0 B. Q/a C. Q/b D. Q/r E. Q/r2 3. Two events are separated in space by a distance ∆x and in time by an interval ∆t. Which of the following quantities must have the same value if the events are viewed by an observer in a different reference frame, moving at a speed v relative to the first? We write β ≡ v/c and γ = 1/ √ 1− β2. A. ∆x/γ B. γ∆t C. (∆x/γ)2 − (γc∆t)2 D. (c∆t)2 − (∆x)2 E. (c∆t)2 + (∆x)2