Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 21, Problem 13P
(II) Three charged particles are placed at the corners of an equilateral triangle of side 1.20 m (Fig. 21–53). The charges are +7.0 μC, –8.0 μC, and –6.0 μC. Calculate the magnitude and direction of the net force on each due to the other two.
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(II) Three positive particles of equal charge, +17.0 µC, are
located at the corners of an equilateral triangle of side
15.0 cm (Fig. 16–53). Calculate
the magnitude and direction of
the net force on each particle
+17.0 µC
due to the other two.
FIGURE 16–53
Problem 12.
+17.0 μC
15.0 cm +17.0 µC
15.0 cm
15.0 cm
(II) Particles of charge +65, +48, and –95 µC are placed
in a line (Fig. 16–52). The center one is 0.35 m from each of
the others. Calculate the net force on each charge due to
the other two.
+65 µC
+48 µC
-95 µC
0.35 m
0.35 m
FIGURE 16–52 Problem 11.
13. (II) Three positive particles of equal
charge, +17.0 μC, are located at the cor-
ners of an equilateral triangle of side
15.0 cm (Fig.21-55 ). Calculate the
magnitude and direction of the net force
on each particle due to the other two.
Figure 21-55
+170 μC
15.0 cm
15.0 cm
+170 μC 15.0 cm +170 μC
Problem 130.
Chapter 21 Solutions
Physics for Scientists and Engineers with Modern Physics
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...
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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 small charged spheres hang from cords of equal length l as shown in Fig. 16–64 and make small angles 01 and 02 with the vertical. (a) If Q1 = Q, Q2 = 2Q, and m1 = m2 = m, determine the ratio 01/02. (b) Estimate the distance between the spheres. FIGURE 16–64 Problem 52. Q1 Q2arrow_forwardProblem 3: (II) Three positive particles of equal charge, +17.0 μC, are located at the corners of an equilateral triangle of side 15.0 cm (Fig. 16-53). Calculate the magnitude and direction of the net force on each particle due to the other two. FIGURE 16-53 +17.0 μC 15.0 cm 15.0 cm Problem 12. +17.0 με 15.0 cm +17.0 μСarrow_forward(II) Two point charges, Q1 = -32 µC and Q2 = +45 µC, are separated by a distance of 12 cm. The electric field at the point P (see Fig. 16–57) is zero. How far from Qj is P? Q1 Q2 12 cm P -32 μC +45 µC FIGURE 16-57 Problem 32.arrow_forward
- (i) A negative point charge of 8.0 nC and a positive point charge of 2.5 nC are placed 9 cm apart. Calculate the magnitude of the force acting on one of these charges. (Note: take the value of the Coulomb's law constant to be 8.99 x 10⁹ Nm²/C²).arrow_forward(III) The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in Fig. 16–39. Assume that the net average charge (due to electron sharing) indicated on H and N atoms has magnitude 0.2e and on the indicated C and O atoms is 0.4e. Assume also that atoms on each molecule are separated by 1.0 × 10-10 m. Estimate the net force between (a) a thymine and an adenine; and (b) a cytosine and a guanine. For each bond (red dots) consider only the three atoms in a line (two atoms on one mol- ecule, one atom on the other). (c) Estimate the total force for a DNA molecule containing 10° pairs of such molecules. Assume half are A-T pairs and half are C-G pairs.arrow_forward(2.)(II) Two equal point charges Q are located on the y axis at y = a and y = -a. (a) What is the force on a charge q located at (x, 0)? (b) For what value of x is the force a maximum? Make a rough plot of F(x), the force as a func- tion of x. (c) When x > a, what is the form of F(x)? (Hint: Use the binomial expansion (1+z)" = 1 + nz for small z.)arrow_forward
- (II) Two point charges, Q₁ = -25 μC and Q2 = +45 μC, are separated by a distance of 12 cm. The electric field at the point P (see Fig. 21-58) is zero. How far from Q₁ is P? 21 -25 μC FIGURE 21-58 Problem 36. P X 12 cm 22 +45 μCarrow_forward(III) An electron (mass m = 9.11 × 10-31 kg) is acceler- ated in the uniform field É (E = 1.45 x 10ʻ N/C) between two thin parallel charged plates. The separation of the plates is E 1.60 cm. The electron is accelerated from rest near the negative plate and passes through a tiny hole in the positive plate, Fig. 16–61. (a) With what speed does it leave the hole? (b) Show that the gravitational force can be ignored. FIGURE 16–61 Problem 36. + + + + + +arrow_forward(II) The field just outside a 3.50-cm-radius metal ball is 3.75 X 102 N/Cand points toward the ball. What charge resides on the ball?arrow_forward
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