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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 20, Problem 26P
What are the strength and direction of an electric field that will balance the weight of (a) a proton and (b) an electron?
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Chapter 20 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 20 - Four lightweight balls A, B, C, and D are...Ch. 20 - Plastic and glass rods that have been charged by...Ch. 20 - a. Can an insulator be charged? If so, how would...Ch. 20 - When you take clothes out of the drier right after...Ch. 20 - The positive charge in Figure Q20.5 is +Q. What is...Ch. 20 - As shown in Figure Q20.6, metal sphere A has 4...Ch. 20 - Figure Q20.7 shows a positively charged rod held...Ch. 20 - A plastic balloon that has been rubbed with wool...Ch. 20 - You are given two metal spheres on portable...Ch. 20 - A honeybee acquires a positive electric charge as...
Ch. 20 - A metal rod A and a metal sphere B, on insulating...Ch. 20 - Iontophoresis is a noninvasive process that...Ch. 20 - A 10 nC charge sits at a point in space where the...Ch. 20 - A hollow soda straw is uniformly charged, as shown...Ch. 20 - A positively charged particle is in the center of...Ch. 20 - Two charged particles are separated by 10 cm....Ch. 20 - A small positive charge q experiences a force of...Ch. 20 - A typical commercial airplane is struck by...Ch. 20 - Microbes such as bacteria have small positive...Ch. 20 - a. Is there a point between a 10 nC charge and a...Ch. 20 - Two lightweight, electrically neutral conducting...Ch. 20 - All the charges in Figure Q20.23 have the same...Ch. 20 - All the charges in Figure Q20.241Q have the same...Ch. 20 - All the charges in Figure Q20.25 have the same...Ch. 20 - A glass bead charged to +3.5 nC exerts an 8.0 104...Ch. 20 - A +7.5 nC point charge and a 2.0 nC point charge...Ch. 20 - Three point charges are arranged as shown in...Ch. 20 - A positive charge is brought near to a dipole, as...Ch. 20 - A glass rod is charged to +5.0 nC by rubbing. a....Ch. 20 - A plastic rod is charged to 20 nC by rubbing. a....Ch. 20 - Prob. 3PCh. 20 - A plastic rod that has been charged to 15.0 nC...Ch. 20 - A glass rod that has been charged to +12.0 nC...Ch. 20 - Two identical metal spheres A and Bare in contact....Ch. 20 - Two identical metal spheres A and Bare connected...Ch. 20 - If two identical conducting spheres are in...Ch. 20 - Two 1.0 kg masses are 1.0 m apart on a...Ch. 20 - A small metal sphere has a mass of 0.15 g and a...Ch. 20 - A small plastic sphere with a charge of 5.0 nC is...Ch. 20 - A small metal bead, labeled A, has a charge of 25...Ch. 20 - A small glass bead has been charged to +20 nC. A...Ch. 20 - What are the magnitude and direction of the...Ch. 20 - In Figure P20.15, charge q2 experiences no net...Ch. 20 - Object A, which has been charged to +10 nC, is at...Ch. 20 - A small glass bead has been charged to +20 nC....Ch. 20 - What magnitude charge creates a 1.0 N/C electric...Ch. 20 - What are the strength and direction of the...Ch. 20 - A 30 nC charge experiences a 0.035 N electric...Ch. 20 - What are the strength and direction of the...Ch. 20 - A +1 0 nC charge is located at the origin. a. What...Ch. 20 - A 10 nC charge is located at the origin. a. What...Ch. 20 - What are the strength and direction of the...Ch. 20 - What are the strength and direction of the...Ch. 20 - What are the strength and direction of an electric...Ch. 20 - A 0.10 g plastic bead is charged by the addition...Ch. 20 - A parallel-plate capacitor is constructed of two...Ch. 20 - A parallel-plate capacitor is formed from two 4.0...Ch. 20 - Two identical closely spaced circular disks form a...Ch. 20 - A parallel-plate capacitor is constructed of two...Ch. 20 - Storm clouds may build up large negative charges...Ch. 20 - A neutral conducting sphere is between two...Ch. 20 - One kind of e-book display consists of millions of...Ch. 20 - A protein molecule in an electrophoresis gel has a...Ch. 20 - Large electric fields in cell membranes cause ions...Ch. 20 - Molecules of carbon mon-oxide are permanent...Ch. 20 - A 2.0-mmdiameter copper ball is charged to +50 nC....Ch. 20 - Pennies today are copper-covered zinc, but older...Ch. 20 - Two protons are 2.0 fm apart. (1 fm= 1 femtometer...Ch. 20 - The nucleus of a 12Xe atom (an isotope of the...Ch. 20 - Two equally charged, 1.00 g spheres are placed...Ch. 20 - Objects A and Bare both positively charged. Both...Ch. 20 - An electric dipole is formed from 1.0 nC point...Ch. 20 - What are the strength and direction of the...Ch. 20 - What are the strength and direction of the...Ch. 20 - What is the force on the 1.0 nC charge in Figure...Ch. 20 - What is the force on the 1.0 nC charge in Figure...Ch. 20 - What is the magnitude of the force on the 1.0 nC...Ch. 20 - What are the magnitude and direction of the force...Ch. 20 - As shown in Figure P20.52, a 5.0 nC charge sits at...Ch. 20 - Two particles have positive charges q and Q. A...Ch. 20 - Model a pollen grain as a sphere of carbon 0.10 mm...Ch. 20 - In a simple model of the hydrogen atom, the...Ch. 20 - A 0.10 g honeybee acquires a charge of +23 pC...Ch. 20 - Two 2.0-cm-diameter disks face each other, 1.0 mm...Ch. 20 - The electron gun in a television tube uses a...Ch. 20 - A 0.020 g plastic bead hangs from a lightweight...Ch. 20 - A 4.0 mg bead with a charge of 2.5 nC rests on a...Ch. 20 - Two 3.0 g spheres on 1.0-m-long threads repel each...Ch. 20 - An electric field E = (100,000 N/C, right) causes...Ch. 20 - An electric field E = (200,000 N/C, right) causes...Ch. 20 - A small charged bead has a mass of 1.0 g. It is...Ch. 20 - A bead with a mass of 0.050 g and a charge of 15...Ch. 20 - A small bead with a positive charge q is free to...Ch. 20 - A parallel-plate capacitor consists of two plates,...Ch. 20 - If the charging collar has a positive charge, the...Ch. 20 - Which of the following describes the charges on...Ch. 20 - Because the droplets are conductors, a droplet's...Ch. 20 - Another way to sort the droplets would be to give...
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- A very small ball has a mass of 5.00 103 kg and a charge of 4.00 C. What magnitude electric field directed upward will balance the weight of the ball so that the ball is suspended motionless above the ground? (a) 8.21 102 N/C (b) 1.22 104 N/C (c) 2.00 102 N/C (d) 5.11 106 N/C (e) 3.72 103 N/Carrow_forwardA point charge of 4.00 nC is located at (0, 1.00) m. What is the x component of the electric field due to the point charge at (4.00, 2.00) m? (a) 1.15 N/C (b) 0.864 N/C (c) 1.44 N/C (d) 1.15 N/C (e) 0.864 N/Carrow_forwardThis afternoon, you have a physics symposium class, and you are the presenter. You will be presenting a topic to physics majors and faculty. You have been so busy that you have not had time to prepare and you dont even have an idea for a topic. You are frantically reading your physics textbook looking for an idea. In your reading, you have learned that the Earth carries a charge on its surface of about 105 C, which results in electric fields in the atmosphere. This gets you very excited about a new theory. Suppose the Moon also carries a charge on the order of 105 C, with the opposite sign! Maybe the orbit of the Moon around the Earth is due to electrical attraction between the Moon and the Earth! Theres an idea for your symposium presentation! You quickly jot down a few notes and run off to your symposium. While you are speaking, you notice one of the professors doing some calculations on a scrap of paper. Uh-oh! He has just raised his hand with a question. Why are you embarrassed?arrow_forward
- Review. A particle with a charge of 60.0 nC is placed at the center of a nonconducting spherical shell of inner radius 20.0 cm and outer radius 25.0 cm. The spherical shell carries charge with a uniform density of 1.33 C/m3. A proton moves in a circular orbit just outside the spherical shell. Calculate the speed of the proton.arrow_forwardIf the electric field at a point on the line between two charges is zero, what do you know about the charges?arrow_forwardA parallel-plate capacitor has a charge Q and plates of area A. What force acts on one plate to attract it toward the other plate? Because the electric field between the plates is E = Q/A0, you might think the force is F = QE = Q2/A0. This conclusion is wrong because the field E includes contributions from both plates, and the field created by the positive plate cannot exert any force on the positive plate. Show that the force exerted on each plate is actually F = Q2/2A0. Suggestion: Let C = 0A/x for an arbitrary plate separation x and note that the work done in separating the two charged plates is W=Fdx.arrow_forward
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- (a) Using the symmetry of the arrangement, show that the electric field at the center of the square in figure 18.46 is zero if the charges on the four comers are exactly equal. (b) Show that this is also true for any combination of charges in which qa= qd and qa = qcarrow_forwardIntegrated Concepts Figure 18.57 shows an electron passing between two charged metal plates that create an 100 N/C vertical electric field perpendicular to the electron's original horizontal velocity. (These can be used to change the electron’s direction, such as in an oscilloscope.) The initial speed of the electron is 3.00106 m/s, and the horizontal distance it travels in the uniform field is 4.00 cm. (a) What is its vertical deflection? (b) What is the vertical component of its final velocity? (c) At what angle does it exit? Neglect any edge effects.arrow_forwardA sphere has a net charge of 8.05 nC, and a negatively charged rod has a charge of 6.03 nC. The sphere and rod undergo a process such that 5.00 109 electrons are transferred from the rod to the sphere. What are the charges of the sphere and the rod after this process?arrow_forward
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