College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 52GP
Two point charges 2.0 cm apart have an electric potential energy –180 μ J. The total charge is 30 nC. What are the two charges?
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Chapter 21 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 21 - By moving a 10 nC charge from point A to point B,...Ch. 21 - Charge q is fired through a small hole in the...Ch. 21 - Why is the potential energy of two opposite...Ch. 21 - An electron (q = e) completes half of a circular...Ch. 21 - An electron moves along the trajectory from i to f...Ch. 21 - The graph in Figure Q21.61Q shows the electric...Ch. 21 - As shown in Figure Q21.7, two protons are launched...Ch. 21 - Each part of Figure Q21.8 shows one or more point...Ch. 21 - Figure Q21.9 shows two points inside a capacitor....Ch. 21 - A capacitor with plates separated by distanced is...
Ch. 21 - Rank in order, from most positive to most...Ch. 21 - Figure Q21.12 shows two points near a positive...Ch. 21 - A. Suppose that E = 0, throughout some region of...Ch. 21 - Rank in order, from largest to smallest, the...Ch. 21 - Figure Q21.16 shows an electric field diagram....Ch. 21 - Figure Q21.17 shows a negatively charged...Ch. 21 - Rank in order, from largest to smallest, the...Ch. 21 - A parallel-plate capacitor with plate separation d...Ch. 21 - A proton is launched from point 1 in Figure Q21...Ch. 21 - A 1.0 nC positive point charge is located at point...Ch. 21 - A 100 V battery is connected across the plates of...Ch. 21 - The electric potential is 300 V at x = 0 cm, is...Ch. 21 - What is the potential at point c? A. 400 v B. 350...Ch. 21 - At which point, a, b, or c, is the magnitude of...Ch. 21 - What is the approximate magnitude of the electric...Ch. 21 - The direction of the electric field at point b is...Ch. 21 - A +10 nC charge is moved from point c to point a....Ch. 21 - A bug zapper consists of two metal plates...Ch. 21 - An atom of helium and one of argon are singly...Ch. 21 - The dipole moment of the heart is shown at a...Ch. 21 - Moving a charge from point A, where the potential...Ch. 21 - The graph in Figure P21.2 shows the electric...Ch. 21 - It takes 3.0 J of work to move a 15 nC charge from...Ch. 21 - A 20 nC charge is moved from a point where V = 150...Ch. 21 - At one point in space, the electric potential...Ch. 21 - An electron has been accelerated from rest through...Ch. 21 - A proton has been accelerated from rest through a...Ch. 21 - What potential difference is needed to accelerate...Ch. 21 - An electron with an initial speed of 500,000 m/s...Ch. 21 - A proton with an initial speed of 800,000 m/s is...Ch. 21 - The electric potential at a point that is halfway...Ch. 21 - A 2.0 cm 2.0 cm parallel-plate capacitor has a...Ch. 21 - Two 2.00 cm 2.00 cm plates that form a...Ch. 21 - A. In Figure P21.14, which capacitor plate, left...Ch. 21 - A +25 nC charge is at the origin. How much farther...Ch. 21 - A. What is the electric potential at points A, B,...Ch. 21 - A 1.0-cm-diameter sphere is charged to a potential...Ch. 21 - What is the electric potential at the point...Ch. 21 - a. What is the potential difference between the...Ch. 21 - A. In Figure P21.20, which point, A or B, has a...Ch. 21 - In Figure P21.21, the electric potential at point...Ch. 21 - What is the potential difference between xi = 10...Ch. 21 - What are the magnitude and direction of the...Ch. 21 - What are the magnitude and direction of the...Ch. 21 - Two 2.0 cm 2.0 cm square aluminum electrodes,...Ch. 21 - An uncharged capacitor is connected to the...Ch. 21 - You need to construct a 100 pF capacitor for a...Ch. 21 - A switch that connects a battery to a 10 F...Ch. 21 - What is the voltage of a battery that will charge...Ch. 21 - Two electrodes connected to a 9.0 V battery are...Ch. 21 - Initially, the switch in Figure P21 .33 is open...Ch. 21 - A 1.2 nF parallel-plate capacitor has an air gap...Ch. 21 - A science-fair radio uses a homemade capacitor...Ch. 21 - A 25 pF parallel-plate capacitor with an air gap...Ch. 21 - Two 2.0-cm-diameter electrodes with a 0.1...Ch. 21 - A parallel-plate capacitor is connected to a...Ch. 21 - A parallel-plate capacitor is charged by a 12.0 V...Ch. 21 - To what potential should you charge a 1.0 F...Ch. 21 - A pair of 10 F capacitors in a high-power laser...Ch. 21 - Capacitor 2 has half the capacitance and twice the...Ch. 21 - Two uncharged metal spheres, spaced 15.0 cm apart,...Ch. 21 - 50 pJ of energy is stored in a 2.0 cm 2.0 cm 2.0...Ch. 21 - A 2.0-cm-diameter parallel-plate capacitor with a...Ch. 21 - What is the change in electric potential energy of...Ch. 21 - What is the potential difference V34 in Figure...Ch. 21 - A 50 nC charged particle is in a uniform electric...Ch. 21 - At a distance r from a point charge, the electric...Ch. 21 - The 4000 V equipotential surface is 10.0 cm...Ch. 21 - What is the electric potential energy of the...Ch. 21 - Two point charges 2.0 cm apart have an electric...Ch. 21 - Two positive point charges are 5.0 cm apart. If...Ch. 21 - A +3.0 nC charge is at x = 0 cm and a 1.0 nC...Ch. 21 - A 3.0 nC charge is on the x-axis at x = 9 cm and a...Ch. 21 - A 10.0 nC point charge and a +20.0 nC point charge...Ch. 21 - A 2.0-mm-diameter glass bead is positively...Ch. 21 - In a semiclassical model of the hydrogen atom, the...Ch. 21 - What is the electric potential at the point...Ch. 21 - a. What is the electric potential at point A in...Ch. 21 - A protons speed as it passes point A is 50,000...Ch. 21 - A proton follows the path shown in Figure P21.63....Ch. 21 - Electric outlets have a voltage of approximately...Ch. 21 - Estimate the magnitude of the electric field in a...Ch. 21 - A Na+ion moves from inside a cell, where the...Ch. 21 - Suppose that a molecular ion with charge 10e is...Ch. 21 - The electric field strength is 50,000 V/m inside a...Ch. 21 - A parallel-plate capacitor is charged to 5000 V. A...Ch. 21 - A proton is released from rest at the positive...Ch. 21 - The electric field strength is 20,000 V/m inside a...Ch. 21 - In the early 1900s, Robert Millikan used small...Ch. 21 - Two 2.0-cm-diameter disks spaced 2.0 mm apart form...Ch. 21 - In proton-beam therapy, a high-energy beam of...Ch. 21 - A 2.5-mm-diameter sphere is charged to 4.5 nC. An...Ch. 21 - A proton is fired from far away toward the nucleus...Ch. 21 - Two 10.0-cm-diameter electrodes 0.50 cm apart form...Ch. 21 - Two 10.0-cm-diameter electrodes 0.50 cm apart form...Ch. 21 - Determine the magnitude and direction of the...Ch. 21 - Figure P21.81 shows the electric potential on a...Ch. 21 - A capacitor consists of two 6.0-cm-diameter...Ch. 21 - The dielectric in a capacitor serves two purposes....Ch. 21 - The highest magnetic fields in the world are...Ch. 21 - The flash unit in a camera uses a special circuit...Ch. 21 - A Lightning Strike Storm clouds build up large...Ch. 21 - A Lightning Strike Storm clouds build up large...Ch. 21 - A Lightning Strike Storm clouds build up large...Ch. 21 - A Lightning Strike Storm clouds build up large...Ch. 21 - A Lightning Strike Storm clouds build up large...
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- Plastic beads can often carry a small charge and therefore can generate electric fields. Three beads are oriented such that 92 is between q₁ and 93. The sum of the charge on 9₁ and 92 is 9₁ + 92 = −2.9 µС, and the net charge of the system of all three beads is zero. E field lines 93 92 What charge does each bead carry? 91 92 -1.45 What is the net charge of the system? What charges have to be equal? μC 2.9 ✓ What is the net charge of the system? What charges have to be equal? μC 93 2.9 μεarrow_forwardNo chatgpt pls will upvotearrow_forwardPoint charges of 6.50 μC and -2.50 μC are placed 0.300 m apart. (Assume the negative charge is located to the right of the positive charge. Include the sign of the value in your answers.) (a) Where can a third charge be placed so that the net force on it is zero? 0.49 m to the right of the -2.50 μC charge (b) What if both charges are positive? 0.49 xm to the right of the 2.50 μC chargearrow_forward
- Find the electric field at the location of q, in the figure below, given that q₁ =9c9d = +4.60 nC, q = -1.00 nC, and the square is 20.0 cm on a side. (The +x axis is directed to the right.) magnitude direction 2500 x What symmetries can you take advantage of? What charges are the same magnitude and the same distance away? N/C 226 × How does charge sign affect the direction of the electric field? counterclockwise from the +x-axis 9a 9b % 9 9darrow_forwardwould 0.215 be the answer for part b?arrow_forwardSuppose a toy boat moves in a pool at at a speed given by v=1.0 meter per second at t=0, and that the boat is subject to viscous damping. The damping on the boat causes the rate of speed loss to be given by the expression dv/dt=-2v. How fast will the boat be traveling after 1 second? 3 seconds? 10 seconds? Use separation of variables to solve this.arrow_forward
- What functional form do you expect to describe the motion of a vibrating membrane without damping and why?arrow_forwardIf speed is tripled, how much larger will air drag become for an object? Show the math.arrow_forwardWhat does it tell us about factors on which air drag depends if it is proportional to speed squared?arrow_forward
- What is the net charge on a sphere that has the following? x (a) 5.75 × 106 electrons and 8.49 × 106 protons 4.39e-13 What is the charge of an electron? What is the charge of a proton? C (b) 200 electrons and 109 protons 1.60e-10 What is the charge of an electron? What is the charge of a proton? Carrow_forwardA spider begins to spin a web by first hanging from a ceiling by his fine, silk fiber. He has a mass of 0.025 kg and a charge of 3.5 μC. A second spider with a charge of 4.2 μC rests in her own web exactly 2.1 m vertically below the first spider. (a) What is the magnitude of the electric field due to the charge on the second spider at the position of the first spider? 8.57e3 N/C (b) What is the tension in the silk fiber above the first spider? 0.125 How does the electric field relate to the force? How do you calculate the net force? Narrow_forwardPoint charges of 6.50 μC and -2.50 μC are placed 0.300 m apart. (Assume the negative charge is located to the right of the positive charge. Include the sign of the value in your answers.) (a) Where can a third charge be placed so that the net force on it is zero? 0.49 m to the right of the -2.50 μC charge (b) What if both charges are positive? 0.185 xm to the right of the 2.50 μC chargearrow_forward
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