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

Download Quiz on Electromagnetic Theory - PHYS4210 - Prof. James J. Napolitano and more Quizzes Physics in PDF only on Docsity! Name: PHYS4210 Electromagnetic Theory Quiz 22 Feb 2010 This is a closed book quiz! Write the best choice in the space next to the question. 1. Two point charges q are separated by a distance a and are otherwise in vacuum. The total energy stored in the electric field set up by the charges is A. q2/a if you include the “self energy” of the charges B. q2/a if you neglect the “self energy” of the charges C. −q2/a if you include the “self energy” of the charges D. −q2/a if you neglect the “self energy” of the charges E. infinite if you neglect the “self energy” of the charges 2. A spherically symmetric charge distribution has a charge density ρ(r) = Arα (in esu/cm3) where A and α are positive constants, and r is the distance from the center. The total charge enclosed by a sphere at radius r is proportional to A. rα B. r1+α C. r2+α D. r3+α E. r4+α 3. A spherically symmetric charge distribution has a charge density ρ(r) = Arα (in esu/cm3) where A and α are positive constants, and r is the distance from the center. The electric field at radius r is proportional to A. rα B. r1+α C. r2+α D. r3+α E. r4+α