PHYS 2102 Midterm: PHYS 2102 LSU Spring 09Test1
Document Summary
February 5, 2009: please be sure to write your name and class instructor above, the test consists of 4 questions (multiple choice, no partial credit), and 4 problems (numerical), for the problems: show your reasoning and your work. No other reference material is allowed during the exam: good luck! The figure shows a central particle of charge 2q, surrounded by two circular rings of charged particles. Figure (a) shows a plastic rod which has charge q uniformly spread along its length. Figures (b), (c), and (d) more plastic rods are added to form sides of a square, each rod has the same negative charge q. An electric dipole, with equal and opposite charges of magnitude 5. 1 c that are separated by 450 nm, is located in a uniform electric field of magnitude 10 v/m. Answer with words or indicate on the figure. (c) (10 pts) instead, the dipole is rotated from an angle of 30o to an angle of 115o.
