Final Speed of Electron - General Physics - Past Paper, Exams of Physics

Download Final Speed of Electron - General Physics - Past Paper and more Exams Physics in PDF only on Docsity! St. Vincent College PH 112: General Physics I Exam I 2/2/2004 The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages. Problem 1 25 Problem 2 20 Problem 3 25 Problem 4 30 Total 100 1. (25 pts) a) (5 pts) When rubbed with bunny fuzz, two objects repel each other. What can be said about the sign of the charge on these two objects? b) (5 pts) A third object is rubbed with bunny fuzz. This object is attracted by the other two objects. What can be said about the sign of the charge on the third object? c) (5 pts) If the bunny fuzz used in part (a) were brought near the third object from part (b), would the force between them be attractive or repulsive? Explain your reasoning. d) (5 pts) The two charged objects from part (a) are then placed on a pedestal inside a closed box. Would the net electric flux through the box (from the electric field created by the two charged objects) remain the same or change if the objects were subsequently placed on a lower pedestal (but remain inside the box)? e) (5 pts) If there is no net electric flux through a certain closed surface, can anything be said about the presence or absence of individual charges inside the surface? Why or why not?