College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 17, Problem 1RQ
Review Question 17.1 To decide whether an object is electrically charged, we need to observe its repulsion from some other objects, not its attraction. Why is attraction insufficient?
Expert Solution & Answer
To determine
The reason behind attraction being an insufficient condition for deciding whether an object is electrically charged or not.
Answer to Problem 1RQ
Solution:
Attraction can exist between a charged and a neutral object also, due to the charging by induction. So, attraction is not sufficient to decide whether the object is charged or not. Repulsion cannot exist because of an induced charge so repulsion is a sufficient condition.
Explanation of Solution
Introduction:
There are various methods of charging an object, such as charging by friction, charging by induction, charging by conduction, and grounding.
Charging by induction is the method in which a neutral object is placed near the charged object and since there are electrons and protons in every atom of an object, they will either attract or repel each other. So, the positive (protons) and negative (electrons) charges that make a nucleus neutral, are separated by the presence of an external charged object. So, on one side there will be negatively charged electrons and on the other side there will be positively charged protons. This is called polarization of the object. The sides near the object of known charge (assume positive) will be of the opposite charge (negative) and vice versa. Neutral objects are attracted towards the charged object irrespective of the fact whether the charge is positive or negative.
Explanation:
Suppose a positively charged object is placed near a metal piece. Since electrons are loosely bound in the atoms of metals, electrons will move towards the face that is near the positively charged object. When electron leaves the atom, the atom will get positively charged. Since the face with the negative charge is near the positively charged object, the metal piece will be attracted towards the positively charged object.
To decide whether an object is electrically charged or not, the object needs to be placed near another object of known charge. If it is repelled by the object, then the first object could be of positive or negative charge. But, if the two objects are attracted to each other, it is not sufficient to decide because a charged object can induce a charge of the opposite sign on the neutral object. It means that the attraction between the objects can exist due to an induced charge. Thus, it will not be possible to decide whether the object was charged prior to the process, or charge has been induced by the second object.
Conclusion:
Therefore, repulsion is a sufficient condition for deciding whether an object is electrically charged or not.
Want to see more full solutions like this?
Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
schedule02:40
Students have asked these similar questions
Consider a image that is located 30 cm in front of a lens. It forms an upright image 7.5 cm from the lens. Theillumination is so bright that that a faint inverted image, due to reflection off the front of the lens, is observedat 6.0 cm on the incident side of the lens. The lens is then turned around. Then it is observed that the faint,inverted image is now 10 cm on the incident side of the lens.What is the index of refraction of the lens?
2. In class, we discussed several different flow scenarios for which we can make enough
assumptions to simplify the Navier-Stokes equations enough to solve them and obtain
an exact solution. Consulting the cylindrical form of the Navier-Stokes equations copied
below, please answer the following questions.
др
a
1 a
+
+0x-
+
+O₂
= Pgr
+ μl
18²v, 2 ave ²v₁]
az2
+
at
or
r de r
Əz
dr
ar
Vodvz
др
[18
+
+
+Or
+
+Vz
= Pgz
+fl
at
ar
r 20
ôz
ôz
dr
ave
дов
V,Ve
ave
+Or
+
+
= pge
at
dr r 80
Əz
+
az2
a.) In class, we discussed how the Navier-Stokes equations are an embodiment of Newton's
2nd law, F = ma (where bolded terms are vectors). Name the 3 forces that we are considering in
our analysis of fluid flow for this class.
др a 10
1 ve 2 av 2200]
+
+μ
or
42 30
b.) If we make the assumption that flow is "fully developed" in the z direction, which term(s)
would go to zero? Write the term below, describe what the term means in simple language (i.e.
do not simply state "it is the derivative of a with…
1. Consult the form of the x-direction Navier-Stokes equation below that we discussed in
class. (For this problem, only the x direction equation is shown for simplicity). Note that
the equation provided is for a Cartesian coordinate system. In the spaces below, indicate
which of the following assumptions would allow you to eliminate a term from the
equation. If one of the assumptions provided would not allow you to eliminate a
particular term, write "none" in the space provided.
du
ди
at
( + + + 매일)
du
ди
=
-
Pgx
dy
др
dx
²u
Fu
u
+ fl
+
ax2 ay²
az2
-
дх
-
Əz
1 2 3 4 5 6 7 8 9
Assumption
Flow is in the horizontal direction (e.g. patient lying
on hospital bed)
Flow is unidirectional in the x-direction
Steady flow
We consider the flow to be between two flat,
infinitely wide plates
There is no pressure gradient
Flow is axisymmetric
Term(s) in equation
Chapter 17 Solutions
College Physics
Ch. 17 - Review Question 17.1 To decide whether an object...Ch. 17 - Review Question 17.2 The model of charging by...Ch. 17 - Review Question 17.3 One cannot charge a held...Ch. 17 - Review Question 17.4 Two charged objects (1 and 2)...Ch. 17 - Review Question 17.5 How can we reduce the...Ch. 17 - Review Question 17.6
How would our reasoning in...Ch. 17 - Review Question 17.7 In a Van de Graaff generator,...Ch. 17 - Which of the following occurs when two objects are...Ch. 17 - 2. With which statements do you disagree?
a. If...Ch. 17 - 3. Which explanation agrees with the contemporary...
Ch. 17 - When an object gets charged by rubbing, where does...Ch. 17 - Choose all of the quantities that are constant in...Ch. 17 - Identically charged point-like objects A and B are...Ch. 17 - When separated by distance d, identically charged...Ch. 17 - Balloon A has charge q, and identical mass balloon...Ch. 17 - Imagine that two charged objects are the system of...Ch. 17 - Two objects with charges + q and -2q are separated...Ch. 17 - Charged point-like objects A and B are separated...Ch. 17 - 12. If you move a negatively charged balloon...Ch. 17 - 13. Describe the differences between the electric...Ch. 17 - Prob. 14CQCh. 17 - At one time it was thought that eclectic charge...Ch. 17 - 16. What experiments can you do to show that there...Ch. 17 - An object becomes positively charged due to...Ch. 17 - List everything that you know about electric...Ch. 17 - 19. What experimental evidence supports the idea...Ch. 17 - 20. You have an aluminum pie pan with pieces of...Ch. 17 - You have a charged metal ball. How can you reduce...Ch. 17 - 22. You have a foam rod rubbed with felt and a...Ch. 17 - A positively charged metal ball A is placed near...Ch. 17 - 24. Show that if the charge on B in the previous...Ch. 17 - 25. Two metal balls of the same radius are placed...Ch. 17 - 26. Describe the experiments that were first used...Ch. 17 - 27. The electrical force that one electric charge...Ch. 17 - 28. Why isn’t Coulomb's law valid for large...Ch. 17 - 29. How is electric potential energy similar to...Ch. 17 - BIO Ventricular defibrillation During ventricular...Ch. 17 - 2. * You rub two 2.0-g balloons with a wool...Ch. 17 - * Two balloons of different mass hang from strings...Ch. 17 - * Lightning A cloud has a large positive charge....Ch. 17 - 5. Sodium chloride (table salt) consists of sodium...Ch. 17 - * EST (a) Earth has an excess of 6105 electrons on...Ch. 17 - 7. Determine the electrical force that two protons...Ch. 17 - * Determine the number of electrons that must be...Ch. 17 - BIO Ions on cell walls The membrane of a body cell...Ch. 17 - * Hydrogen atom in a simplified model of a...Ch. 17 - * Three 100 nC charged objects are equally spaced...Ch. 17 - ** Tow objects with charges q and 4q are separated...Ch. 17 - * Salt crystal Four ions (Na+,Cl-,Na+,andCl-) in a...Ch. 17 - * A+106C charged object and a+2106C charged object...Ch. 17 - 15. **BIO Bee pollination Bees acquire an electric...Ch. 17 - 16. * A triangle with equal sides of length 10 cm...Ch. 17 - 17. You have a small metal sphere fixed on an...Ch. 17 - 18. * After the experiment in Problem 17.17, you...Ch. 17 - 20. (a) Determine the change in electric potential...Ch. 17 - You have a system of two positively charged...Ch. 17 - You have a system of two negatively charged...Ch. 17 - 23. Repeat (a)-(c) of Problem 17.22 for a system...Ch. 17 - The metal sphere on the top of a Van de Graaff...Ch. 17 - * EST An electron is 0.10 cm from an object with...Ch. 17 - * (a) An object with charge q4=+3.010-9C is moved...Ch. 17 - 27. * An object with charge is moved from...Ch. 17 - +8nCandq2=4nC are placed at marks...Ch. 17 - 29. * Two small objects with charges + Q and -Q...Ch. 17 - 30. * A stationary block has a charge of . A...Ch. 17 - Figure P17.31 shows four different configurations...Ch. 17 - * Evaluate the solution Metal sphere 1 has charge...Ch. 17 - 37. * Construct separate force diagrams for each...Ch. 17 - 38. “ The six objects shown in Figure P17.38 have...Ch. 17 - * A small metal ball with positive charge + q and...Ch. 17 - 40. * Four objects each with charge are located...Ch. 17 - 41. * Two 5.0-g aluminum foil balls hang from...Ch. 17 - 42. * A 6.0-g ball with charge hangs from a...Ch. 17 - * A 0.40-kg cart with charge +4.010-8C starts at...Ch. 17 - A dust particle has an excess charge of 4106...Ch. 17 - Electric accelerator A micro-transporter moves...Ch. 17 - * You are holding at rest a small sphere A with...Ch. 17 - * A Van de Graaff generator is placed in rarefied...Ch. 17 - 48. * Two protons each of mass and charge +e are...Ch. 17 - 49. * Two protons, initially separated by a very...Ch. 17 - * An alpha particle consists of two protons and...Ch. 17 - * Determine the speed that the proton shown in...Ch. 17 - 52. ** Suppose that Earth and the Moon initially...Ch. 17 - 53. * BIO Calcium ion synapse transfer Children...Ch. 17 - 54. A small ball D has a charge of and cannot...Ch. 17 - 55. *Two small balls A and B with equal charges +...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your domes from the dryer...Ch. 17 - Static cling You pull your clothes from the dryer...Ch. 17 - Electrostatic exploration Geologists sometimes...Ch. 17 - Electrostatic exploration Geologists sometimes...Ch. 17 - Electrostatic exploration Geologists sometimes...Ch. 17 - Electrostatic exploration Geologists sometimes...Ch. 17 - Electrostatic exploration Geologists sometimes...Ch. 17 - Electrostatic exploration Geologists sometimes...
Additional Science Textbook Solutions
Find more solutions based on key concepts
What percentage of Earths land surface do glaciers presently cover? ____________
Applications and Investigations in Earth Science (9th Edition)
Why is petroleum jelly used in the hanging-drop procedure?
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
Use the following graph to answer questions 3 and 4. 3. Which of the lines best depicts the log phase of a ther...
Microbiology: An Introduction
16. Explain some of the reasons why the human species has been able to expand in number and distribution to a g...
Campbell Biology: Concepts & Connections (9th Edition)
26. The earth’s radius is about 4000 miles. Kampala, the capital of Uganda, and Singapore are both nearly on t...
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Which culture uses NAD+? Use the following choices to answer questions. a. E. coli growing in glucose broth at ...
Microbiology: An Introduction
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Don't use ai to answer I will report you answerarrow_forwardwhy did the expert subtract the force exerted by the hand and the elbow by the force due to the weight of the hand and forearm and force exerted by the tricep. Does the order matter and how do you determine what to put first. Question 4 AP, CHAPTER 13 FROM BASIC BIOMECHANICS 8TH EDITIONarrow_forwardThe drawing illustrates the dispersion of light by a prism. The prism is made from a certain type of glass, and has a cross section shaped like an equilateral triangle. The indices of refraction for the red and violet light in this type of glass are 1.649 and 1.694, respectively. The angle of incidence for both the red and violet light is 60.0°. Find the angles of refraction at which the (a) red and (b) violet rays emerge into the air from the prism. Glass prism Incident light Normal (a) Normal Incident light Red (660 nm) (b) Violet (410 nm)arrow_forward
- Don't use ai to answer I will report you answerarrow_forwardA glass block (n = 1.56) is immersed in a liquid. A ray of light within the glass hits a glass- liquid surface at a 70.0° angle of incidence. Some of the light enters the liquid. What is the smallest possible refractive index for the liquid?arrow_forwardThe drawing shows a crystalline slab (refractive index 1.995) with a rectangular cross section. A ray of light strikes the slab at an incident angle of 01 = 35.0°, enters the slab, and travels to point P. This slab is surrounded by a fluid with a refractive index n. What is the maximum value of n such that total internal reflection occurs at point P? Ме Buarrow_forward
- What is the amount of M112 needed to breach a 5-foot thick dense concrete wall utilizing an internal charge placed in the center of the target?arrow_forwardA small postage stamp is placed in front of a concave mirror (radius = 1.1 m), such that the image distance equals the object distance. (a) What is the object distance? (b) What is the magnification of the mirror (with the proper sign)?arrow_forwardCalculate the anti-clockwise torque and the clockwise torque of the system with the ruler and the washers. Record these values in Data Table 5. Ruler = 11.56 g, small washer = 1.85 g, large washer = 24.30 g. Calculate the % Difference in the Torques and record the values in Data Table 5. Is ΣAnticlockwise torque and Anticlockwise torque the same thing, are they solved in the same way?arrow_forward
- A window washer stands on a uniform plank of mass M = 142 kg and length l = 2.80 m supported by 2 ropes attached at the ends of the plank. The window washer has a mass m = 68.0 kg. What is the tension in each of the ropes, T1 and T2, if the window washer's displacement from the center of mass of the plank is x = 0.930 m as shown in Figure 1: Window Washer Problem?arrow_forwardA man holds a double-sided spherical mirror so that he is looking directly into its convex surface, 33 cm from his face. The magnification of the image of his face is +0.17. What will be the image distance when he reverses the mirror (looking into its concave surface), maintaining the same distance between the mirror and his face? Be sure to include the algebraic sign (+ or -) with your answer.arrow_forwardHow do you draw a diagram of the ruler and mass system in equilibrium identifying the anti-clockwise torque and clockwise torque? How do I calculate the anti-clockwise torque and the clockwise torque of the system with the ruler and the washers, does it come from the data in table 4? Please help, thank you!arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
8.02x - Lect 1 - Electric Charges and Forces - Coulomb's Law - Polarization; Author: Lectures by Walter Lewin. They will make you ♥ Physics.;https://www.youtube.com/watch?v=x1-SibwIPM4;License: Standard YouTube License, CC-BY