PHY 142 Midterm: PHYS 142 University of Rochester P142 2008 Exam 1
Document Summary
Please read the problems carefully and answer them in the space provided. Write on the back of the page, if necessary. Problem 1 (10 pts, give brief justification for partial credit): Three charges (+q,-q, +q) are placed at the vertices of an equilateral triangle as shown in the figure. The force on +q due to the charges +q and q: points in the positive x direction, points in the negative x direction, points in the positive y direction, points in the negative y direction. is zero. Problem 2 (10 pts, give brief justification for partial credit): Consider the potential across the plates of a parallel-plate capacitor. Problem 3 (10 pts, give brief justification for partial credit): Four identical charges are moved in a uniform electric field on the paths shown in the figure. The dots represent the initial and the arrows the final positions of the charges.
