Physics 2213
Homework #2
Spring 2010
Read:
Chapter 21, sections 21.5, 6
Chapter 22, intro., sections 22.1 thru 22.4
Handouts:
Electric Field Line Model, Gauss' Law
Basic Ideas:
Electric Field Lines & the Electric Field Line Model
Electric Field, Electric Flux, & Gauss' Law
Superposition Principle for Electric Fields
Math Skills:
Geometry, Trigonometry, & Symmetry Principles
Integration to find net electric fields
Surface Integrals & Flux of a Vector Field
Learning Goals:
(Be sure you understand where and how each goal applies to our homework,
discussion, lecture, and lab activities.)
*
Distinguish between electric field lines and electric field vectors, and show how they are
related through the Electric Field Line Model.
*
Sketch and describe the electric field line geometry for these charge distributions:
point
charge (+ or ), electric dipole (+  pair), 2 like charges (++ or  ), sphere of charge, long line
of charge, long cylinder of charge, flat sheet of charge.
*
Use symmetry properties of electric charge distributions to deduce properties of their
electric fields, such as field directions or places where the field is zero.
*
Use Gauss' Law to determine the strengths of electric fields in charge systems of sufficiently
high symmetry — spherical, cylindrical, and planar.
*
Apply the Superposition Principle for electric fields.
*
Conceptually translate an equation for an electric field as a function of position into a graph.
*
Determine asymptotic limiting forms for electric fields as functions of position at small and
large distances from electric charge distributions, and interpret these forms physically.
*
Show that algebraic and numerical results have correct units and are physically reasonable.
For extra practice:
Chap. 21:
E's & P's: #21.62, 90, 91, 99, 107
(not quizzed or collected) Chap. 22: Q's #Q22.16, 9;
E's & P's #22.1, 5, 7, 8, 11, 13, 49, 63
To be prepared for a Quiz on WednesdayFriday, Feb. 1012, at your 2nd weekly Discussion
session and your notes written up & handed in at the start of that session:
#21.57
[Two Charge Sheets]
Use the
Superposition Principle
along with the results for the
electric field due to a single large flat sheet of charge as deduced by Gauss' Law.
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 Spring '07
 PERELSTEIN,M
 Electrostatics, Gauss' Law, Magnetism, Work, Heat, Magnetic Field, Electric charge

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