PHYS 1051 Midterm: PHYS 1051 Fall 2011 Term Test 2
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Instructions: there are four questions, each consisting of short theory part and a problem solving part. Answer all the questions: the amount of points awarded for each question is in the bracket next to it. Budget your time accordingly: do not erase or whiteout your answers. Draw a line through what you think: please use three signi cant gures in all calculations, relax. A uniformly charged rod rod of length l has a total charge +q. The rod lies along the y axis, as shown in the gure. A point p is located a distance 3. 2 l to the right of the bottom of the rod as shown. [2 points: write an expression for the x-component dex of the contribution to the electric eld at p from the charge on segment dy. [4 points: calculate the x-component of the electric eld ex at point p due to entire rod.
