5. Which of the following rows identifies the direction of the electric field and the nature of the oil droplet's charge? Row 0 Direction of Electric Field Toward the bottom of the page Toward the top of the page Toward the bottom of the page Toward the top of the page Nature of the Oil Droplet's Charge Negative Negative Positive Positive

5. Which of the following rows identifies the direction of the electric field and the nature of the oil droplet's charge? Row 0 Direction of Electric Field Toward the bottom of the page Toward the top of the page Toward the bottom of the page Toward the top of the page Nature of the Oil Droplet's Charge Negative Negative Positive Positive

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter22: Electricity And Magnetism

Section: Chapter Questions

Problem 28P: You are working on a research project in which you must control the direction of travel of electrons...

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Review. A block having mass m and charge + Q is connected to an insulating spring having a force constant k. The block lies on a frictionless, insulating, horizontal track, and the system is immersed in a uniform electric field of magnitude E directed as shown in Figure P24.6. The block is released from rest when the spring is unstretched (at x = 0). We wish to show that the ensuing motion of the block is simple harmonic. (a) Consider the system of the block, the spring, and the electric field. Is this system isolated or nonisolated? (b) What kinds of potential energy exist within this system? (c) Call the initial configuration of the system that existing just as the block is released from rest. The final configuration is when the block momentarily comes to rest again. What is the value of x when the block comes to rest momentarily? (d) At some value of x we will call x = x0, the block has zero net force on it. What analysis model describes the particle in this situation? (c) What is the value of x0? (f) Define a new coordinate system x such that x = x x0. Show that x satisfies a differential equation for simple harmonic motion. (g) Find the period of the simple harmonic motion. (h) How does the period depend on the electric field magnitude? Figure P24.6
A person is placed in a large, hollow, metallic sphere that is insulated from ground, (a) If a large charge is placed on the sphere, will the person be harmed upon touching the inside of the sphere? (b) Explain what will happen if the person also has an initial charge whose sign is opposite that of the charge on the sphere.
In which of the following contexts can Gausss law not be readily applied to find the electric field? (a) near a long, uniformly charged wire (b) above a large, uniformly charged plane (c) inside a uniformly charged ball (d) outside a uniformly charged sphere (e) Gausss law can be readily applied to find the electric field in all these contexts.
You are a coach for the Physics Olympics team participating in a competition overseas. You are given the following sample problem to present to your team of students, which you need to solve very quickly: A person is standing on the midline of a soccer field. At one end of the field, as shown in Figure P24.28, is a letter D, consisting of a semicircular metallic ring of radius R and a long straight metal rod of length 2R, the diameter of the ring. The plane of the ring is perpendicular to the ground and perpendicular to the midline of the field shown by the broken line in Figure P24.28. Because of an approaching lightning storm, the semicircular ring and the rod become charged. The ring and the rod each attain a charge Q. What is the electric potential at point P, which is at a position x along the midline of the field, measured from the center of the rod, due to the letter D? Think quickly and use all resources available to you, which include your physics textbook: yon are in competition! Figure P24.28
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Review. A 1.00-g cork ball with charge 2.00 C is suspended vertically on a 0.500-m-long light string in the presence of a uniform, downward-directed electric field of magnitude E = 1.00 105 N/C. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum. (a) Determine the period of this oscillation. (b) Should the effect of gravitation be included in the calculation for part (a)? Explain.
The electric field everywhere on the surface of a charged sphere of radius 0.230 m has a magnitude of 575 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere? (b) What can you conclude about the nature and distribution of charge inside the sphere?
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Three charged particles are aligned along the x axis as shown in Figure P22.35. Find the electric field at (a) the position (2.00 m, 0) and (b) the position (0, 2.00 m). Figure P22.35
(a) Would life be different if the electron were positively charged and the proton were negatively charged? (b) Does the choice of signs have any bearing on physical and chemical interactions? Explain your answers.
A horizontal beam of electrons initially moving at v, = 3.6x107 m/s is deflected by the vertical electric field between oppositely charged plates as shown in Figure 1 below. The magnitude of the electric field E = 2.0×104 N/C. The horizontal length of the plates L=2.5 cm. You can ignore any gravitational effect here. A. What is the direction of the electric field between the plates? B. What is the charge per unit area on the plates? C. What is the vertical deflection d of the electrons as they leave the plate? V₁ = 3.6x107 m/s Figure 1 L = 2.5 cm 1| Page
A proton and electron in a hydrogen atom are separated on the average by about 5.3 x 10^-11 m. What is the magnitude of the electric field set up by the proton at the position of the electron? 1.) what is the equation that will be used? 2.) what is the actual value?