Two very large, nonconducting plastic sheets, each 10.0 cm thick, carry uniform charge densities s1, s2, s3, and s4 on their surfaces (?Fig. E22.30 ). These surface charge densities have the values ?1 = -6.00 µC/m2, ?2 = +5.00 µC/m2, ?3 = +2.00 µC/m2, and ?4 = +4.00 µC/m2. Use Gauss’s law to find the magnitude and direction of the electric field at the following points, far from the edges of these sheets: (a) point A, 5.00 cm from the left face of the left-hand sheet; (b) point B, 1.25 cm from the inner surface of the right-hand sheet; (c) point C, in the middle of the right-hand sheet.
HIST 261001 Spring 2015 Midterm Examination Guide Your midterm exam will be given on March 5 during our class period. You will have the entire hour and 15 minutes to complete your exam. Please bring a blank blue book (no name or anything written in the book) along with a pencil or pen to the exam. You may also bring a standardsized notecard with any notes you wish to use during the exam. The notecard will be collected, but not graded, at the end of the examination. The exam will consist of five essay questions. You will choose three and write a brief, but thorough, response to each. The questions will be broad and focus on your ability to address major issues of concerns by historians, not the memorization of geographical locations or dates. Each response should include an identifiable argument and strong evidence from our classroom discussions, lectures, and assigned readings. It is highly recommended that you survey your reaction papers, readings, and notes as you review for the exam. Possible examination topics include: how perceptions of African history have shaped the study of the precolonial African past the relationship between African people and their environments the ways in which the geography has impacted African communities the place of Egypt in African history the influence of Christianity and Islam on different African societies how historians interpret diverse sources to understand African history different political formations in precolonial Africa