10. The figure below shows 4 different arrangements of charges labeled A to D. In each case 2 positive charges are repelling each other. The magnitudes of the charges are indicated by q or 2q. In which case is the magnitude of the force of repulsion the smallest? a) A c) C b) B d) D e) The forces are all the same 2r Я 2q ов 2r 2q 2q 2q b. 11. Charged balls are placed as shown in figures 1 and 2. The white ball is repelled by the gray and the black ball in both pictures. What can you say about the charges? Figure 2 Figure 1 a) The white ball and the black ball have opposite charges. b) The white ball and the grey ball have opposite charges. c) All the balls have same charge (negative or positive) d) One ball must be neutral. e) More information is needed to answer the question. 12. Which of the arrows best represents the direction of the net force on charge +Q due to the other two charges? 1 2 F2 /Fnet +2Q > +Q +4Q F1 a) 1 b) 2 c) 3 d) 4 e) 5 3

10. The figure below shows 4 different arrangements of charges labeled A to D. In each case 2 positive charges are repelling each other. The magnitudes of the charges are indicated by q or 2q. In which case is the magnitude of the force of repulsion the smallest? a) A c) C b) B d) D e) The forces are all the same 2r Я 2q ов 2r 2q 2q 2q b. 11. Charged balls are placed as shown in figures 1 and 2. The white ball is repelled by the gray and the black ball in both pictures. What can you say about the charges? Figure 2 Figure 1 a) The white ball and the black ball have opposite charges. b) The white ball and the grey ball have opposite charges. c) All the balls have same charge (negative or positive) d) One ball must be neutral. e) More information is needed to answer the question. 12. Which of the arrows best represents the direction of the net force on charge +Q due to the other two charges? 1 2 F2 /Fnet +2Q > +Q +4Q F1 a) 1 b) 2 c) 3 d) 4 e) 5 3

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter18: Electric Charge And Electric Field

Section: Chapter Questions

Problem 20PE: (a) Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed...

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An object with negative charge is placed in a region of space where the electric field is directed vertically upward. What is the direction of the electric force exerted on this charge? (a) It is up. (b) It is down. (c) There is no force. (d) The force can be in any direction.
A large charge +Q and a small charge q are a short distance apart. How do the electric forces on each charge compare? Is this comparison described by another physical law? (Hint: See Chapter 3.4.)
(a) Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece’s weight. Assuming equal point charges (only an approximation), calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a mg piece of tape held 1.00 cm above another. (b) Discuss whether the magnitude of this charge is consistent with what is typical of static electricity.
Using the symmetry of the arrangement, determine the direction of the force on q in the figure below, given that qa=qb=+7.50C and qc = qd = 7.50C. (b) Calculate the magnitude of the force on the charge q, given that the square is 10.0 cm on a side and q = 2.00 C.
(a) Two point charges q1 and q23.00 m apart, and their total charge is 20 C. (a) If the force of repulsion between them is 0.075N, what are magnitudes of the two charges? (b) If one charge attracts the other with a force of 0.150 N, what are the magnitudes of the two charges? Note that you may need to solve a quadratic equation to reach your answer.
Why do most objects tend to contain nearly equal numbers of positive and negative charges?
Why do most objects tend to contain nearly equal numbers of positive and negative charges?
Two point charges exert a 5.00 N force on each other. What will the force become if the distance between them is increased by a factor of three?
If two equal charges each of 1 C each are separated in air by a distance of 1 km, what is the magnitude of the force acting between them? You will see that even at a distance as large as 1 km, the repulsive force is substantial because 1 C is a very significant amount of charge.
The fundamental charge is e = 1.60 1019 C. Identify whether each of the following statements is true or false. (a) Its possible to transfer electric charge to an object so that its net electric charge is 7.5 times the fundamental electric charge, e. (b) All protons have a charge of +e. (c) Electrons in a conductor have a charge of e while electrons in an insulator have no charge.
Refer 10 Figure 15.20. The charge lowered into the center of the hollow conductor has a magnitude of 5 C. Find the magnitude and sign of the charge on the inside and outside of the hollow conductor when the charge is as shown in (a) Figure 15.20a, (b) Figure 15.20b, (c) Figure 15.20c, and (d) Figure 15.20d.
Describe how a positively charged object can be used to give another object a negative charge. What is the name of this process?