Electric Potential Electric Potential Energy versus Electric Potential Gravitational Force and Potential Energy First we review the force and potential energy of an object of mass gravitational field that points downward (in the near the earth's surface.

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Physics 202
Assignment 2
Due at 11:00pm on Wednesday, February 6, 2008
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Exercise 22.5
Description: A hemispherical surface with radius r in a re

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Physics 202
Assignment 3
Due at 11:00pm on Wednesday, February 13, 2008
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Electric Fields and Equipotential Surfaces
Description: Find the work d

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Physics 202
Assignment 1
Due at 11:00pm on Wednesday, January 30, 2008
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Coulomb's Law Tutorial
Description: Use Coulomb's law to compute the (ve

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Physics 202
Assignment 10
Due at 11:00pm on Sunday, April 13, 2008
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The Resonance Peak
Description: Short quantitative problem on resonance in a series

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Elisfri 2, vor 2007
21. Electric Charge and Field
Assignment is due at 2:00am on Wednesday, January 24, 2007
Credit for problems sub

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Physys 202 Fall08
HW4
Due at 11:00pm on Wednesday, October 8, 2008
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Introduction to Electric Current
Description: Mostly conceptual questions about el

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Elisfri 2, vor 2007
30. Inductance
Assignment is due at 2:00am on Wednesday, March 14, 2007
Credit for problems submitted late will decrease to 0% after the deadline

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Physics 202
Assignment 12
Due at 11:00pm on Wednesday, April 23, 2008
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Geometry and Reflections
Description: A case of reflection from multiple surfaces

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phy260S09
HW13
Due at 12:00am on Monday, June 1, 2009
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Heating a Water Bath
Description: Calculate the time required for a resistor to heat a water bath t

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phy260S09
HW9
Due at 11:00pm on Thursday, April 16, 2009
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Charged Aluminum Spheres
Description: Find the number of electrons in an aluminum sphe

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Physys 202 Fall08
HW5
Due at 11:00pm on Wednesday, October 15, 2008
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Problem 26.36
Description: (a) Determine the currents I_1, I_2, and I_3 in the fi

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33. The Nature and Propagation of Light
Assignment is due at 2:00am on Wednesday, January 17, 2007
Credit for pr

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Physics 202
Assignment 6
Due at 11:00pm on Wednesday, March 5, 2008
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Magnetic Force on Charged Particles Conceptual Question
Description: Simple conceptual

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Physics 202
Assignment 5
Due at 11:00pm on Wednesday, February 27, 2008
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Problem 25.2
Description: A service station charges a battery using a current of

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Physics 202
Assignment 4
Due at 11:00pm on Wednesday, February 20, 2008
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Potential Difference and Electric-Field Energy of a Spherical Capacitor

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phy260S09
HW12
Due at 11:00pm on Tuesday, May 12, 2009
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Capacitors in Series
Description: Contains several questions that help practice basic ca

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HW11
Due at 11:00pm on Tuesday, May 5, 2009
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Energy Stored in a Charge Configuration
Description: Find the work required to assemble f

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HW10
Due at 11:00pm on Tuesday, April 28, 2009
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Charged Ring
Description: Find the electric field from a uniformly charged ring (quali

29.28. Model: The electric potential at the dot is the sum of the potentials due to each charge.
Visualize: Please refer to Figure EX29.28. Solve: The electric potential at the dot is
V=
1 q1 1 q2 1 q3 + + 4 0 r1 4 0 r2 4 0 r3
5.0 109 C 5.0 109 C q = ( 9

28.4. Model: The electric flux flows out of a closed surface around a region of space containing a net
positive charge and into a closed surface surrounding a net negative charge. Visualize: Please refer to Figure EX28.4. Let A be the area in m2 of each o

27.10. Model: The rod is thin, so assume the charge lies along a line. Visualize:
Solve: The force on charge q is F = qErod . From Example 27.3, the electric field a distance r from the center of a charged rod is
Erod = Thus, the force is
1
Q
4 0 r r 2 +

26.14. Model: Model the plastic spheres as point charges.
Visualize:
Solve:
(a) The charge q1 = 50.0 nC exerts a force F1 on 2 on q2 = 50.0 nC to the right, and the charge q2 exerts
9 2 2 9 9 K q1 q2 ( 9.0 10 N m /C ) ( 50.0 10 C ) ( 50.0 10 C ) = = 0.056

22.2. Model: Two closely spaced slits produce a double-slit interference pattern.
Visualize: The interference pattern looks like the photograph of Figure 22.3(b). It is symmetrical, with the m = 2 fringes on both sides of and equally distant from the cent

24.40. Model: Assume thin lenses and treat each as a simple magnifier with M = 25cm/f .
Visualize: Equation 24.10 gives the magnification of a microscope.
M = mobjM eye =
L 25cm f obj f eye
Solve: (a) The more powerful lens (4) with the shorter focal len

23.4. Model: Light rays travel in straight lines. Also, the red and green light bulbs are point sources.
Visualize:
Solve:
The width of the aperture is w = 1 m. From the geometry of the figure for red light,
w2 x = x = 2w = 2 (1.0 m ) = 2.0 m 1m 3m + 1m
T

PHYS-225
Homework 225C
Fall 2009
Dr. Russell
Part 1: Mean and Uncertainty (6 pts) The data set at right shows a set of data points representing measurements of the electric field at a certain location.
1. Enter this data into an Excel spreadsheet. 2. Calc

Chapte 24. Ele r ctric Pote ntial
24.1. What is Physics? 24.2. Ele ctric Pote ntial Ene rgy 24.3. Ele ctric Pote ntial 24.4. Equipote ntial S urface s 24.5. C alculating thePote ntial fromtheFie ld 24.6. Pote ntial Dueto a Point C harge 24.7. Pote ntial D

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36. Diffraction
Assignment is due at 2:00am on Wednesday, January 17, 2007
Credit for problems submitted late wi

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35. Interference
Assignment is due at 2:00am on Wednesday, January 17, 2007
Credit for problems submitted late w