Pearson eText for College Physics: Explore and Apply -- Instant Access (Pearson+)
2nd Edition
ISBN: 9780137443000
Author: Eugenia Etkina, Gorazd Planinsic
Publisher: PEARSON+
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Chapter 18, Problem 21CQ
Explain how shielding works.
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Consider the situation in the figure below; a neutral conducting ball hangs from the ceiling by an insulating string, and a charged insulating rod is going to be placed nearby.
A. First, if the rod was not there, what statement best describes the charge distribution of the ball?
1) Since it is a conductor, all the charges are on the outside of the ball. 2) The ball is neutral, so it has no positive or negative charges anywhere. 3) The positive and negative charges are separated from each other, but we don't know what direction the ball is polarized. 4) The positive and negative charges are evenly distributed everywhere in the ball.
B. Now, when the rod is moved close to the ball, what happens to the charges on the ball?
1) There is a separation of charges in the ball; the side closer to the rod becomes positively charged, and the opposite side becomes negatively charged. 2) Negative charge is drawn from the ground (via the string), so the ball acquires a net negative charge. 3)…
answer question 5-9
AMPS
VOLTS
OHMS
5) 50 A
110 V
6) .08 A
39 V
7) 0.5 A
60
8) 2.5 A
110 V
Chapter 18 Solutions
Pearson eText for College Physics: Explore and Apply -- Instant Access (Pearson+)
Ch. 18 - Review Question 18.1 How do you estimate the...Ch. 18 - Review Question 18.2 You have a point-like object...Ch. 18 - Review Question 18.3 Compare the work needed to...Ch. 18 - Review Question 18.4 Imagine that you have an...Ch. 18 - Review Question 18.5 In this section you read that...Ch. 18 - Review Question 18.6 What are the differences...Ch. 18 - Review Question 18.7 A parallel plate capacitor...Ch. 18 - Review Question 18.8 Why do heart contractions...Ch. 18 - 1 What does the field at point A, which is a...Ch. 18 - Why can you shield an object from an external...
Ch. 18 - If you place a block made of a conducting material...Ch. 18 - 4. If you place a block made of a dielectric...Ch. 18 - 5. Two identical positive charges are located at a...Ch. 18 - An electric dipole is placed between the...Ch. 18 - 7. A positive charge is fixed at some distance d...Ch. 18 - Figure Q18.8 shows E field lines in a region of...Ch. 18 - How do we use the model of the electric field to...Ch. 18 - Describe a procedure to determine the E field at...Ch. 18 - What does it mean if the E field at a certain...Ch. 18 - A very small positive charge is placed at one...Ch. 18 - 13. How do we create an E field with parallel...Ch. 18 - 14. Draw a sketch of the field lines caused by...Ch. 18 - 15. Draw a sketch of the field lines caused by...Ch. 18 - 16. Jim thinks that E field lines are the paths...Ch. 18 - Can E field lines cross? Explain why or why not.Ch. 18 - An electron moving horizontally from left to right...Ch. 18 - 19. (a) What does it mean if the electric...Ch. 18 - 20. Explain how grounding works.
Ch. 18 - 21. Explain how shielding works.
Ch. 18 - 22. Explain the difference between the microscopic...Ch. 18 - Explain why, for charged objects submerged in a...Ch. 18 - 24. What does it mean if the dielectric constant k...Ch. 18 - What is the dielectric constant of a metal?Ch. 18 - Describe the relation between the quantities E...Ch. 18 - If the V field in a region is constant, what is...Ch. 18 - 28. Why are uncharged pieces of a dielectric...Ch. 18 - 29. Draw equipotential surfaces and label them in...Ch. 18 - Show a charge arrangement and a point in space...Ch. 18 - 31. Explain what happens when you place a...Ch. 18 - (a) Explain what happens when you place a...Ch. 18 - 33. Explain why the excess charge on an electrical...Ch. 18 - Draw a microscopic representation of the charge...Ch. 18 - 1. * (a) Construct a graph of the magnitude of the...Ch. 18 - * A uranium nucleus has 92 protons. (a) Determine...Ch. 18 - 3. The electron and the proton in a hydrogen atom...Ch. 18 - * Use the superposition principle to draw E field...Ch. 18 - 5. * Use the superposition principle to draw ...Ch. 18 - * E field lines for a field created by an...Ch. 18 - 7. * Two objects with charges C are 50 cm from...Ch. 18 - 8. * charged object is 6.0 cm along a horizontal...Ch. 18 - 9. ** charged object is 4.0 cm along a horizontal...Ch. 18 - 10. **A distance d separates two objects, each...Ch. 18 - 11. * A point-like charged object with a charge +...Ch. 18 - 12. * A 3.0-g aluminum foil ball with a charge of ...Ch. 18 - 13. ** (a) If the string in the previous problem...Ch. 18 - * EST Using Earths E field for flight Earth has an...Ch. 18 - * An electron moving with a speed v0 enters a...Ch. 18 - 10-9 C hangs freely from a 1.0-m-long thread. What...Ch. 18 - 17. A 0.50-g oil droplet with charge is in a...Ch. 18 - 19. * Equation Jeopardy 1 The equations below...Ch. 18 - * Equation Jeopardy 2 The equations below describe...Ch. 18 - 21. During a lightning flash. of charge moves...Ch. 18 - 22. * (a) Construct a graph of the V field created...Ch. 18 - * A horizontal distance d separates two objects...Ch. 18 - * Two objects with charges qand+q are separated by...Ch. 18 - * Four objects with the same charge q are placed...Ch. 18 - 26. Spark jumps to nose An electric spark jumps...Ch. 18 - 27. * Two charged point-like objects are...Ch. 18 - BIO Electric field in body cell The electric...Ch. 18 - * Equation Jeopardy 3 The equation below describes...Ch. 18 - 31. * Equation Jeopardy 4 The equation below...Ch. 18 - 32. * While a sphere with positive charge remains...Ch. 18 - 33. * Figure P18.33 shows field lines in a region...Ch. 18 - 34. * A metal sphere has no charge on it. A...Ch. 18 - 35. ** EST A Van de Graaff generator of radius...Ch. 18 - ** A metal ball of radius R1 has a charge Q. Later...Ch. 18 - 37. * Positively charged metal sphere A is placed...Ch. 18 - *Two small metal spheres A and B have different...Ch. 18 - 39. * An electric dipole such as a water molecule...Ch. 18 - 10-7C at its head and an equal magnitude negative...Ch. 18 - 41. BIO Body cell membrane electric field (a)...Ch. 18 - 42. ** Earth's electric field Earth has an...Ch. 18 - 43. You have a parallel plate capacitor. (a)...Ch. 18 - 44. * A capacitor of capacitance C with a vacuum...Ch. 18 - 45. * A capacitor of capacitance C with a vacuum...Ch. 18 - How does the capacitance of a parallel plate...Ch. 18 - BIO EST Axon capacitance The long thin cylindrical...Ch. 18 - 48. ** Sphere capacitance A metal sphere of radius...Ch. 18 - * BIO EST Capacitance of red blood cell Assume...Ch. 18 - BIO Defibrillator During ventricular fibrillation...Ch. 18 - * EST The dielectric strength of air is 3106V/m....Ch. 18 - * Charged cloud causes electric field on Earth The...Ch. 18 - *BIO Hearts dipole charge The heart has a dipole...Ch. 18 - 55. * In a hot water heater, water warms when...Ch. 18 - 56. ** EST Lightning warms water A lightning flash...Ch. 18 - 57 * Four charged particles A, B, C, and D are...Ch. 18 - 59. ** A small object of unknown mass and charge...Ch. 18 - 61. * BIO Electrophoresis Electrophoresis is used...Ch. 18 - 62. * BIO Energy stored in axon electric field An...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - BIO Electric discharge by eels In several aquatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...Ch. 18 - Electrostatic precipitator (esp) Electrostatic...
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