Physics For Scientists & Engineers, Vols. 1 & 2, And Masteringphysics With E-book Student Access Kit (4th Edition)
4th Edition
ISBN: 9780321542144
Author: Douglas C. Giancoli
Publisher: Addison Wesley
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 21, Problem 7Q
Figures 21–7 and 21–8 show how a charged rod placed near an uncharged metal object can attract (or repel) electrons. There are a great many electrons in the metal, yet only some of them move as shown. Why not all of them?
FIGURE 21-7 Charging by induction.
FIGURE 21-8 Inducing a charge on an object connected to ground.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Useful constants:
k=9.00×109 N.m2/C2
ε0= 8.85×10-12 C2/N.m2
µ0=4π×10-7 T.m/A
mp=1.67×10-27 kg
me=9.11×10-31 kg
e=1.6×10-19 C
g=10.0 m/s2
-------
The time variation of the charge passing by a conductor is given by q(t)=2t^2+2t, where q is given in coulombs and t in seconds. The cross-sectional area of the conductor is 1.6 mm^2. Find the current density (in MA/m^2) through the conductor at t= 5.4 s.
F=0.8975r^-2.00
And re-writing it as:
(4)F=0.8975/r^-2.00
We can now compare it with Coulomb’s equation:
(1)F=K|q1q2|/r^2
So, comparing these equations (4) and (1) we realize that:
k=|q1q2|=0.8975
Plugging in values for charges: q1 = -10µC, and q2 = 10µC, isolating k (Coulomb’s constant), and recalling that 1µC = 10-6 C, we get:
k|-10µC*10µC|=0.8975
k=0.8934/|-10µC*10µC|= 0.8934/10*10^-6C*10*10^-6C (3)
Use this Example calculation above, and the trendline equation (3) coefficients that you have obtained on your graph, to find k. Show your work below. Be careful with powers of ten.
k= 0.8975/|-10µC*10µC|= 0.8975/10*10^-6C*10*10^-6C = (5)
Now, important part in reporting the answer is properly showing its units. To derive the SI units for Coulomb’s constant k, let’s look again at the equation (1), and re-write it as:
k=F*r^2/|q1q2| (6)
Recalling the units for all parameters in this equation:
Force, F – Newtons, [N]
Distance, r –…
Metal sphere A of radius 12.0 cm carries 6.00 μ C of charge, and metal sphere B of radius 18.0 cm carries −4.00 μ C of charge. If the two spheres are attached by a very long conducting thread, what is the final distribution of charge on the two spheres?
Chapter 21 Solutions
Physics For Scientists & Engineers, Vols. 1 & 2, And Masteringphysics With E-book Student Access Kit (4th Edition)
Ch. 21.5 - Return to the Chapter-Opening Question, page 559,...Ch. 21.5 - What is the magnitude of F12 (and F21) in Example...Ch. 21.5 - Determine the magnitude and direction of the net...Ch. 21.5 - (a) Consider two point charges of the same...Ch. 21.6 - Four charges of equal magnitude, but possibly...Ch. 21 - If you charge a pocket comb by rubbing it with a...Ch. 21 - Why does a shirt or blouse taken from a clothes...Ch. 21 - Explain why fog or rain droplets tend to form...Ch. 21 - A positively charged rod is brought close to a...Ch. 21 - Why does a plastic ruler that has been rubbed with...
Ch. 21 - Contrast the net charge on a conductor to the free...Ch. 21 - Figures 217 and 218 show how a charged rod placed...Ch. 21 - When an electroscope is charged, the two leaves...Ch. 21 - The form of Coulombs law is very similar to that...Ch. 21 - We are not normally aware of the gravitational or...Ch. 21 - Is the electric force a conservative force? Why or...Ch. 21 - What experimental observations mentioned in the...Ch. 21 - When a charged ruler attracts small pieces of...Ch. 21 - Explain why the test charges we use when measuring...Ch. 21 - When determining an electric field, must we use a...Ch. 21 - Draw the electric field lines surrounding two...Ch. 21 - Assume that the two opposite charges in Fig. 2134a...Ch. 21 - Consider the electric field at the three points...Ch. 21 - Why can electric field lines never cross?Ch. 21 - Given two point charges, Q and 2Q, a distance ...Ch. 21 - Suppose the ring of Fig. 2128 has a uniformly...Ch. 21 - Consider a small positive test charge located on...Ch. 21 - We wish to determine the electric field at a point...Ch. 21 - In what ways does the electron motion in Example...Ch. 21 - Describe the motion of the dipole shown in Fig....Ch. 21 - Explain why there can be a net force on an...Ch. 21 - (I) What is the magnitude of the electric force of...Ch. 21 - (I) How many electrons make up a charge of 38.0 C?Ch. 21 - (I) What is the magnitude of the force a + 25 C...Ch. 21 - (I) What is the repulsive electrical force between...Ch. 21 - (II) When an object such as a plastic comb is...Ch. 21 - (II) Two charged dust particles exert a force of...Ch. 21 - (II) Two charged spheres are 8.45 cm apart. They...Ch. 21 - (II) A person scuffing her feet on a wool rug on a...Ch. 21 - (II) What is the total charge of all the electrons...Ch. 21 - (II) Compare the electric force holding the...Ch. 21 - (II) Two positive point charges are a fixed...Ch. 21 - (II) Particles of charge +75, +48, and 85 C are...Ch. 21 - (II) Three charged particles are placed at the...Ch. 21 - (II) Two small nonconducting spheres have a total...Ch. 21 - (II) A charge of 4.15 mC is placed at each corner...Ch. 21 - (II) Two negative and two positive point charges...Ch. 21 - (II) A charge Q is transferred from an initially...Ch. 21 - (III) Two charges, Q0 and 4Q0, are a distance ...Ch. 21 - (III) Two positive charges +Q are affixed rigidly...Ch. 21 - (III) Two small charged spheres hang from cords of...Ch. 21 - (I) What are the magnitude and direction of the...Ch. 21 - (I) A proton is released in a uniform electric...Ch. 21 - (I) Determine the magnitude and direction of the...Ch. 21 - (I) A downward electric force of 8.4 N is exerted...Ch. 21 - (I) The electric force on a +4.20-C charge is...Ch. 21 - (I) What is the electric field at a point when the...Ch. 21 - (II) Draw, approximately, the electric field lines...Ch. 21 - (II) What is the electric field strength at a...Ch. 21 - (II) A long uniformly charged thread (linear...Ch. 21 - (II) The electric field midway between two equal...Ch. 21 - (II) Calculate the electric field at one corner of...Ch. 21 - (II) Calculate the electric field at the center of...Ch. 21 - (II) Determine the direction and magnitude of the...Ch. 21 - (II) Two point charges, Q1 = 25 and Q2 = +45 ,...Ch. 21 - (II) A very thin line of charge lies along the x...Ch. 21 - (II) (a) Determine the electric field E at the...Ch. 21 - (II) Draw, approximately, the electric field lines...Ch. 21 - (II) Two parallel circular rings of radius R have...Ch. 21 - (II) You are given two unknown point charges, Q1...Ch. 21 - (II) Use Coulombs law to determine the magnitude...Ch. 21 - (II) (a) Two equal charges Q are positioned at...Ch. 21 - (II) At what position, x = xM, is the magnitude of...Ch. 21 - (II) Estimate the electric field at a point 2.40...Ch. 21 - (II) The uniformly charged straight wire in...Ch. 21 - (II) Use your result from Problem 46 to find the...Ch. 21 - (II) Determine the direction and magnitude of the...Ch. 21 - (II) A thin rod bent into the shape of an arc of a...Ch. 21 - (III) A thin glass rod is a semicircle of radius...Ch. 21 - (III) Suppose a uniformly charged wire starts at...Ch. 21 - (III) Suppose in Example 2111 that x = 0.250m. Q =...Ch. 21 - (III) A thin rod of length carries a total charge...Ch. 21 - (III) Uniform plane of charge. Charge is...Ch. 21 - (III) Suppose the charge Q on the ring of Fig....Ch. 21 - (II) An electron with speed v0 = 27.5 106 m/s is...Ch. 21 - (II) An electron has an initial velocity...Ch. 21 - (II) An electron moving to the right at 7.5 105...Ch. 21 - (II) At what angle will the electrons in Example...Ch. 21 - (II) An electron is traveling through a uniform...Ch. 21 - (II) A positive charge q is placed at the center...Ch. 21 - (II) A dipole consists of charges +e and e...Ch. 21 - (II) The HCl molecule has a dipole moment of about...Ch. 21 - (II) Suppose both charges in Fig. 2145 (for a...Ch. 21 - (II) An electric dipole, of dipole moment p and...Ch. 21 - (III) Suppose a dipole p is placed in a nonuniform...Ch. 21 - (III) (a) Show that at points along the axis of a...Ch. 21 - How close must two electrons be if the electric...Ch. 21 - Given that the human body is mostly made of water,...Ch. 21 - A 3.0-g copper penny has a positive charge of 38...Ch. 21 - Measurements indicate that there is an electric...Ch. 21 - (a) The electric field near the Earths surface has...Ch. 21 - A water droplet of radius 0.018 mm remains...Ch. 21 - Estimate the net force between the CO group and...Ch. 21 - Suppose that electrical attraction, rather than...Ch. 21 - In a simple model of the hydrogen atom, the...Ch. 21 - A positive point charge Q1 = 2.5 105 C is fixed...Ch. 21 - When clothes are removed from a dryer, a 40-g sock...Ch. 21 - A small lead sphere is encased in insulating...Ch. 21 - A large electroscope is made with leaves that are...Ch. 21 - Dry air will break down and generate a spark if...Ch. 21 - Two pint charges, Q1 = 6.7 and Q2 = 1.8 C, are...Ch. 21 - Packing material made of pieces of foamed...Ch. 21 - One type of electric quadrupole consists of two...Ch. 21 - Suppose electrons enter a uniform electric field...Ch. 21 - An electron moves in a circle of radius r around a...Ch. 21 - Three very large square planes of charge are...Ch. 21 - A point charge (m = 1.0 g) at the end of an...Ch. 21 - Four equal positive point charges, each of charge...Ch. 21 - Two small, identical conducting spheres A and B...Ch. 21 - A point charge of mass 0.210 kg, and net charge...Ch. 21 - A one-dimensional row of positive ions, each with...Ch. 21 - (III) A thin ring-shaped object of radius a...Ch. 21 - (III) An 8.00 C charge is on the x axis of a...
Additional Science Textbook Solutions
Find more solutions based on key concepts
The reason Venus is so much hotter than Earth is that (a) it has many more volcanoes; (b) its closer distance t...
Life in the Universe (4th Edition)
The velocity and acceleration vector of the particle as a function of time.
University Physics Volume 1
57. A passenger bus in Zurich, Switzerland, derived its motive power from the energy stored in a large flywheel...
College Physics (10th Edition)
What is the magnitude of the gravitational force between Earth and a 1kg body?
Conceptual Integrated Science
3. What is free-fall, and why does it make you weightless? Briefly describe why astronauts are weightless in th...
The Cosmic Perspective (8th Edition)
1. In uniform circular motion, which of the following are constant: speed, velocity, angular velocity, centripe...
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
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
- Two conducting spheres have charges of Qa = 3C and Qb = -1 C. They are touched together and then returned to their original positions. Afterward, you measure the electrostatic force between them. The electrostatic force a. has switched directions. b. is 0 N. c. is unchanged. d. has changed magnitude, but is in the same direction.arrow_forwardThe amount of charge carried by a lightning bolt is estimated at 10 Coulombs. What quantity of excess electrons is carried by the lightning bolt?arrow_forwardA proton (m=1.67 x 10-27 kg) travels a distance of 3.2 cm parallel to a uniform electric field 2.9 x 105 V/m between the plates shown in the figure. If the initial velocity is 4.3 x 105 m/s, find the magnitude of its final velocity in m/s (ignore gravity) Round your answe to 0 decimal places.arrow_forward
- In one of the classic nuclear physics experiments at the beginning of the 20th century, an alpha particle was accelerated toward a gold nucleus, and its path was substantially deflected by the Coulomb interaction. If the energy of the doubly charged alpha nucleus was 5.00 MeV, how close to the gold nucleus (79 protons) could it come before being deflected?arrow_forwardWhen a shower is turned on in a closed bathroom, thesplashing of the water on the bare tub can fill the room’s air withnegatively charged ions and produce an electric field in the air asgreat as 1000 N/C. Consider a bathroom with dimensions 2.5 m 3.0 m 2.0 m. Along the ceiling, floor, and four walls, approximatethe electric field in the air as being directed perpendicular to the surfaceand as having a uniform magnitude of 600 N/C.Also, treat thosesurfaces as forming a closed Gaussian surface around the room’s air.What are (a) the volume charge density r and (b) the number ofexcess elementary charges e per cubic meter in the room’s air?arrow_forwardthe human hair is combed using a rubber comb. What charge acquired by the hair and by the comb? in 5-10 sentencesarrow_forward
- If conductor P, with a positive charge, is placed in contact with another conductor Q (initially uncharged). After contact what will be the nature of the charge on Q? and on P? How do you know this will happen?arrow_forwardIn a follow-up experiment, a charge of +40 pC was placed atthe center of an artificial flower at the end of a 30-cm-long stem. Beeswere observed to approach no closer than 15 cm from the center of thisflower before they flew away. This observation suggests that the smallestexternal electric field to which bees may be sensitive is closest towhich of these values? (a) 2.4 N/C; (b) 16 N/C; (c) 2.7 * 10^-10 N/C;(d) 4.8 * 10^-10 N/C.arrow_forwardSmokestack scrubber removes undesirable particles by first adding some excess electrons and then using electric forces to pull the particles out of the air. Consider a soot particle of mass msoot= 1.0 x 10^-12 kg that travels upward in a smokestack and a charge of qsoot= 1.1 x 10^-17 C. Assume the electric field in the scrubber is produced by two parallel, square plates of width L=1.0 m and separation d = 0.010 m, with charges +-Q. (a) What must be the value of the electric field between the plates so that the force on the soot particle is equal to the weight of the particle? (A real scrubber use a collectionod many pairs of such plates in parallel) (b) What charge Q on the scrubber's plates is required to produce the electric field in part (a)?arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Electric Fields: Crash Course Physics #26; Author: CrashCourse;https://www.youtube.com/watch?v=mdulzEfQXDE;License: Standard YouTube License, CC-BY