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# slides9all - Hour Exam Wednesday 4:10 pm in Packard 101...

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Hour Exam Wednesday 4:10 pm in Packard 101 info on web – p.

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Today review Practice Exam answer questions – p.
Practice Exam, Q 1 3 2 4 13 V 4 V 8 V I 1 I 3 I 2 a b – p.

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Practice Exam, Q 1 3 2 4 13 V 4 V 8 V I 1 I 3 I 2 a b 1 2 – p.
Physics 21 Fall, 2004 Information about Exam-1 First Hour Exam : There will be an exam on Wednesday, September 22, 2004 at 4:10 pm in Packard 101. The time limit will be one hour. The exam will be closed book and closed notes. Any physical constants and integrals you will need will be given on the exam. The equation sheet posted on the course web site will be included with the exam. Practice Exam : A practice exam will be available on the web by Friday, Sept. 17. Some of the problems on the prac- tice exam are taken from previous exams in Physics 21. If you can work the problems on the practice exam within the time alloted, you should be well prepared for the real exam. The solution to the practice exam will be posted on the web and also discussed in L-9 (lecture 9). Use of Calculators : You should bring a calculator. For some questions you may need to solve simultaneous algebraic equations, for example, three equations in three unknowns. You must solve such equations by hand and show the so- lutions for full credit. In general, setting up the equations correctly will be worth more than solving them. Coverage : The exam will cover all the reading assignments through and including L-9: (lecture 9). Chapter 21: § 1–10 Chapter 22, 23, 24: all Chapter 25: § 1–6,8 Chapter 26: § 1–5 The exam will emphasize the material covered in lecture, recitation or homework. The following is a list of topics and questions you should be familiar with. This list is not necessarily complete but is representative. Know the vector form of Coulomb’s Law. Find the electric field of several point charges. For a distribution of charges on a line, find λ . Find σ or ρ for two- or three- dimensional distributions. Know how to integrate over a linear charge distribution to get the electric field or potential at an arbitrary point. What is the relation between the electric field and the electric potential? Find the electric potential of several point charges. Draw the electric field lines and the equipotential lines of a point charge. Do the same for a dipole. What is the electric field of an infinite sheet of charge? Use this result to find the electric field between the par- allel plates of a capacitor. What is the energy density in an electric field? How much energy is stored in a charged capacitor? Find the speed of an electron in a circular orbit about a proton, given the mass and radius. What is Gauss’s Law? Use Gauss’s Law to find the field of a spherical, planar, cylindrical, or linear charge distribution.

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