PHY122_Review_M1

PHY122_Review_M1 - PHY122 Physics for the Life Sciences II...

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HY122 hysics for the Life Sciences PHY122 Physics for the Life Sciences Physics for the Life Sciences II II Review Midterm 1 Chapters 20, 21, 22, 23 Clicker Channel 21 Review M1 1 09/27/2010
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M1 Formulae 09/27/2010 Review M1 2
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M1 Formulae 09/27/2010 Review M1 3
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M1 Formulae ate/Time: uesday Oct 4, 8:30pm 0:00pm Date/Time: Tuesday Oct 4, 8:30pm 10:00pm • Room: Javits 100 • Note: we SHARE this room with another Exam … 09/27/2010 Review M1 4
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Charge If two identical conducting spheres are in contact, any excess charge will be evenly distributed between them. Three identical metal spheres are labeled A , B , and C . Initially, A has charge q , B has charge q /2 , and C is uncharged. hat is the final charge on each sphere if touched to – What is the final charge on each sphere if C is touched to B , removed, and then touched to A ? – Starting again from the initial conditions, what is the charge on each sphere if C is touched to A , removed, and then touched to B ? 09/27/2010 Review M1 5
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If two macroscopic objects are electrically attracted to each other … A. both objects must be negatively charged. B. both objects must be positively charged. C. one object must be negatively charged and negat ely charged and the other object must be positively charged. % % % % D. None of the above statements are absolutely true. nswer 09/27/2010 Review M1 6 A. B. C. D. 0% 0% 0% 0% 0 of 1 Answer Now Countdown 60
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Electric Field A long conducting rod is suspended by insulating strings. Assume that the rod is initially electrically neutral, and remains so. The atoms in the rod are composed of +ve nuclei and –ve electrons. An external electric field is applied to the right – What is the force on the electrons and the nuclei in the rod when the external field E is applied? Both electrons and nuclei experience a force to the right. The nuclei experience a force to the right and the electrons experience a force to the left. The electrons experience a force to the left but the nuclei experience no force. The electrons experience no force but the nuclei experience a force to the right. –W hat is the motion of the electrons and the atomic nuclei caused by the external field? Both electrons and nuclei move to the right. The nuclei move to the right and the electrons move to the left through equal distances. The electrons move to the left and the nuclei are almost stationary. he electrons are almost stationary and the nuclei move to the right The electrons are almost stationary and the nuclei move to the right. – Imagine that the rightward current flows in the rod for a short time. As a result, what will the net charge on the right and left ends of the rod become? left end negative and right end positive left end negative and right end negative left end negative and right end nearly neutral left end nearly neutral and right end positive both ends nearly neutral – The charge imbalance that results from this movement of charge will generate an additional electric field near the rod. In what direction will this field point?
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PHY122_Review_M1 - PHY122 Physics for the Life Sciences II...

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