Physics 2213
Homework #3
Spring 2009
Read:
Chapter 22, section 22.5;
Chapter 25, intro., sections 25.1, 2, 3
Chapter 23, intro., sections 23.1 (thru mid of p. 782), 23.2 (thru p. 791, incl. Ex. 23.3)
Handouts:
Conductors in Electrostatic Equilibrium
;
Electric Current, Voltage, & Potential
Learning Goals:
(Be sure you understand where and how each goal in each assignment applies to our
homework, discussion, lecture, and lab activities.)
*
Use Gauss' law along with basic mechanics and electrostatics principles to deduce the
presence or absence of electric fields and electric charge in, on, or near conductors in
electrostatic equilibrium.
*
Draw electric field lines in the vicinity of conductors in electrostatic equilibrium, and use the
geometry of those lines to determine relative electric field strengths at different locations.
*
Use the Method of Image Charges to determine the magnitude and direction of the electric
field due to electric charges near a conducting plane.
*
Use the relationships between electric charge and electric fields to explain and calculate the
strengths of electric effects in physical phenomena discussed in lecture and your textbook.
*
Show how to determine voltage (electric potential difference) from electric field and vice
versa using line or path integrals or space derivatives along with equations or graphs.
*
Determine the electric current, current density, electric field, voltage, resistivity, drift
velocity, or geometry in currentcarrying conductors, given appropriate other quantities.
*
GENERAL SKILL:
Conceptually translate an equation for electric field or potential difference
as a function of position into a graph (without doing detailed numerical calculations).
*
GENERAL SKILL:
Show that your algebraic and numerical results have the correct units.
*
GENERAL SKILL:
Show that your algebraic and numerical results are physically reasonable.
For extra practice:
Chap. 22: Q's #Q22.1012, 1417;
E's & P's #22.23, 31, 43, 46, 49
(not quizzed)
Chap. 23:
Q's #Q23.5, 8, 10, 12, 13, 17, 19, 20
Chap. 25: Q's #Q25.13, 913;
E's & P's #25.3, 8, 17, 27
To be prepared for WednesdayFriday, Feb. 1113, at your 2nd weekly Discussion session:
#Q23.7
[Closed Path Line Integral]
#22.37
[Coaxial Cable]
#22.47
[Concentric Spherical Shells]
#22.51
[Conducting Plate]
#25.61
[Efields in a Wire]
Please add:
(e)
What is the
drift speed
of the electrons in each
segment of the wire if the mobile electron density in copper is 8.5 x 10
28
m
3
?
How much time
would it take an electron to travel the length of each wire segment?
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 Spring '07
 PERELSTEIN,M
 Electrostatics, Magnetism, Work, Heat, Electric charge, Incl

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