Test 1 2019 solutions - PHYSICS 316 TEST#1 SOLUTIONS Friday Sept 22 5-7 pm What should I do if I performed poorly on this test Study the answers to

Test 1 2019 solutions - PHYSICS 316 TEST#1 SOLUTIONS...

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PHYSICS 316: TEST #1 SOLUTIONS Friday, Sept. 22, 5-7 pm What should I do if I performed poorly on this test? Study the answers to all questions you got wrong until you understand them. If you don’t understand the answers from the attached solutions, see Professor Downer during office hours M 5:00-6:30 pm in RLM 10.320 or after class, or TA Harold Johnson during discussion session M 330-430pm in ECJ 1.214 or his office hours MW 11-12 noon in RLM 9.208. Can I still pass the course if I failed this test? Yes. In fact you can still get an “A”. One hour test grade will be dropped. In addition, if you continue doing homework assignments and participating in class, you will be eligible for the final exam “over-ride” as described on the syllabus. The final exam will be cumulative. Thus approximately 1/3 of it will consist of questions very similar to those on this hour test. That is why it is crucial to understand the correct answers to this test now.
* Questions marked with an asterisk are explained at the end of this file. HISTORY (16 pts).1 thru 6.(2 pts each)For each person in the first list 1 – 6 below, choose one description A thru J from the second list that best describes one of his contributions to the science of electrostatics. You will NOT use all of the choices A thru J, nor will you use any of them more than once. 1. Auguste Coulomb (F)4. William Gilbert (C)2. Michael Faraday (E)5.Robert Millikan (J)3. Karl Friedrich Gauss (H)6. Robert van de Graaff (G)A.I showed that a magnetic north pole repels electrostatic “+” charges and attracts electrostatic “-“ charge. B.I developed a mathematical law relating the electric flux on an open surface to the charge located on the surface. C.I first clearly differentiated magnetic and electric interactions. I first observed electrostatic repulsion and identified many materials that I called “electrics” that exhibited electrostatic interactions. D. I observed the contraction of frog's leg muscles when connected to a bi-metal junction. E.I lived inside a metal box for a while, where I detected no electric field, even though the outside was powerfully charged, and lightning flashes were darting from its surface. I also developed the concept of electric field lines. F. I measured the electric force between two charged spherical objects with a torsion balance, and observed that this force varied as the inverse square of the distance between the objects. G.I developed an electrostatic generator that transfers large amounts of charge from a rotating insulating belt onto a spherical conducting capacitor. H.I developed a mathematical law relating the electric flux through a closed surface to the net charge inside the surface I.I derived the concepts of "+" and "-" charge, "point charge" and "polarization by induction" from systematic observations of repulsion & attraction between electrified objects.

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