chapter 15 electric forces and electric fields conceptual quiz questions
TRANSCRIPT
Chapter 15Electric Forces and
Electric Fields
Conceptual QuizQuestions
Chapter 15: Electric Forces and Electric Fields
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The diagram below shows the initial charge and position of three metal spheres, X, Y, and Z, on insulating stands.Sphere X is brought into contact with sphere Y and then removed. Then sphere Y is brought into contact with sphere Z and removed. What is the charge on sphere Z after this procedure is completed?
(A) +1 x 10-6 C
(B) +3 x 10-6 C
(C) +2 x 10-6 C
(D) +4 x 10-6 C
Ch15: Electric Charge and Electric Field (02 of 35)
Chapter 15: Electric Forces and Electric Fields
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Gravitational field strength is to newtons per kilogram as electric field strength is to
(A) coulombs per joule
(B) coulombs per newton
(C) joules per coulomb
(D) newtons per coulomb
Ch15: Electric Charge and Electric Field (03 of 35)
Chapter 15: Electric Forces and Electric Fields
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Two similar metal spheres possessing +1.0 coulomb of charge and -1.0 coulomb of charge, respectively, are brought toward each other. Which graph best represents the relationship between the magnitude of the electric force between the spheres and the distance between them?
(A) (B) (C) (D)
Ch15: Electric Charge and Electric Field (04 of 35)
Chapter 15: Electric Forces and Electric Fields
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The diagram below shows two metal spheres charged to +1.0 x 10-6 coulomb and +3.0 x 10-6 coulomb, respectively, oninsulating stands. The spheres are touched together and then returned to their original positions. as a result, the magnitude of the electrostatic force between the spheres changes from 3.0 N to
(A) 1.5 N
(B) 2.0 N
(C) 4.0 N
(D) 6.0 N
Ch15: Electric Charge and Electric Field (05 of 35)
Chapter 15: Electric Forces and Electric Fields
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Which diagram best represents the electric field around a negatively charged conducting sphere?
(A) (B) (C) (D)
Ch15: Electric Charge and Electric Field (06 of 35)
Chapter 15: Electric Forces and Electric Fields
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The diagram shows the arrangement of three charged hollow metal spheres, A, B, and C. The arrows indicate the direction of the electric forces acting between the spheres. At least two of the spheres are positively charged. Which sphere, if any, could be negatively charged?
(A) sphere A (B) sphere B (C) sphere C (D) no sphere
Ch15: Electric Charge and Electric Field (07 of 35)
Chapter 15: Electric Forces and Electric Fields
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An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce No change in the electrostatic force between the spheres?
(A) doubling q on one sphere while doubling r
(B) doubling q on both spheres while doubling r
(C) doubling q on one sphere while halving r
(D) doubling q on both spheres while halving r
Ch15: Electric Charge and Electric Field (08 of 35)
Chapter 15: Electric Forces and Electric Fields
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The Millikan oil drop experiment determined the smallest unit of
(A) mass
(B) weight
(C) electric charge
(D) electric field strength
Ch15: Electric Charge and Electric Field (09 of 35)
Chapter 15: Electric Forces and Electric Fields
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A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk
(A) acquires a positive charge also.
(B) acquires a negative charge.
(C) remains neutral.
(D) could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
Ch15: Electric Charge and Electric Field (10 of 35)
Chapter 15: Electric Forces and Electric Fields
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Is it possible for a positive and a negative charge to attract each other?
(A) Yes, they always attract.
(B) Yes, they will attract if they are close enough.
(C) Yes, they will attract if one carries a larger charge than the other.
(D) No, they will never attract.
Ch15: Electric Charge and Electric Field (11 of 35)
Chapter 15: Electric Forces and Electric Fields
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A proton carries a
(A) positive charge.
(B) neutral charge.
(C) negative charge.
(D) variable charge.
Ch15: Electric Charge and Electric Field (12 of 35)
Chapter 15: Electric Forces and Electric Fields
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An atom has more electrons than protons. The atom is
(A) a positive ion.
(B) a negative ion.
(C) a superconductor.
(D) impossible.
Ch15: Electric Charge and Electric Field (13 of 35)
Chapter 15: Electric Forces and Electric Fields
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An originally neutral electroscope is briefly touched with a positively charged glass rod. The electroscope
(A) remains neutral.
(B) becomes negatively charged.
(C) becomes positively charged.
(D) could become either positively or negatively charged, depending on the time of contact.
Ch15: Electric Charge and Electric Field (14 of 35)
Chapter 15: Electric Forces and Electric Fields
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An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope
(A) remains neutral.
(B) is negatively charged.
(C) is positively charged.
(D) could be either positively or negatively charged, depending on how long the contact with ground lasted.
Ch15: Electric Charge and Electric Field (15 of 35)
Chapter 15: Electric Forces and Electric Fields
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A large negatively charged object is placed on an insulated table. A neutral metallic ball rolls straight toward the object, but stops before it touches it. A second neutral metallic ball rolls along the path followed by the first ball, strikes the first ball, and stops. The first ball rolls forward, but does not touch the negative object. At no time does either ball touch the negative object. What is the final charge on each ball?
(A) The first ball is positive, and the second ball is negative.
(B) The first ball is negative, and the second ball is positive.
(C) Both balls remain neutral.
(D) Both balls are positive.
Ch15: Electric Charge and Electric Field (16 of 35)
Chapter 15: Electric Forces and Electric Fields
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Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge.
(A) The first charge exerts a larger force on the second charge.
(B) The second charge exerts a larger force on the first charge.
(C) The charges exert forces on each other equal in magnitude and opposite in direction.
(D) The charges exert forces on each other equal in magnitude and pointing in the same direction.
Ch15: Electric Charge and Electric Field (17 of 35)
Chapter 15: Electric Forces and Electric Fields
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Two charged objects attract each other with a certain force. If the charges on both objects are doubled with no change in separation, the force between them
(A) quadruples.
(B) doubles.
(C) halves.
(D) increases, but we can't say how much without knowing the distance between them.
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r
QQkF
Ch15: Electric Charge and Electric Field (18 of 35)
Chapter 15: Electric Forces and Electric Fields
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Two charged objects attract each other with a force F. What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduced to one-fourth its original value? The force is now equal to
(A) 16F.
(B) 24F.
(C) (3/8)F.
(D) 96F.
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Ch15: Electric Charge and Electric Field (19 of 35)
Chapter 15: Electric Forces and Electric Fields
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An electron and a proton are separated by a distance d. What happens to the magnitude of the force on the proton if a second electron is placed next to the first electron?
(A) It quadruples.
(B) It doubles.
(C) It will not change.
(D) It goes to zero.
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Ch15: Electric Charge and Electric Field (20 of 35)
Chapter 15: Electric Forces and Electric Fields
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An electron and a proton are separated by a distance d. What happens to the magnitude of the force on the first electron if a second electron is placed next to the proton?
(A) It doubles.
(B) It does not change.
(C) It is reduced to half.
(D) It becomes zero.
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0F
Ch15: Electric Charge and Electric Field (21 of 35)
Chapter 15: Electric Forces and Electric Fields
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A point charge of +Q is placed at the center of a square. When a second point charge of Q is placed at one of the square's corners, it is observed that an electrostatic force of 2.0 N acts on the positive charge at the square's center. Now, identical charges of Q are placed at the other three corners of the square. What is the magnitude of the net electrostatic force acting on the positive charge at the center of the square?
(A) zero (B) 2.8 N
(C) 4.0 N (D) 8.0 N
Ch15: Electric Charge and Electric Field (22 of 35)
A point charge of +Q is placed at the centroid of an equilateral triangle. When a second charge of +Q is placed at one of the triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?
(A) zero (B) 4.0 N
(C) 8.0 N (D) 16 N
Chapter 15: Electric Forces and Electric Fields
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Ch15: Electric Charge and Electric Field (23 of 35)
Chapter 15: Electric Forces and Electric Fields
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Which of the following is not a vector?
(A) electric force
(B) electric field
(C) electric charge
(D) electric line of force
Ch15: Electric Charge and Electric Field (24 of 35)
Chapter 15: Electric Forces and Electric Fields
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Is it possible to have a zero electric field value between a negative and positive charge along the line joining the two charges?
(A) Yes, if the two charges are equal in magnitude.
(B) Yes, regardless of the magnitude of the two charges.
(C) No, a zero electric field cannot exist between the two charges.
(D) cannot be determined without knowing the separation between the two charges
Ch15: Electric Charge and Electric Field (25 of 35)
Chapter 15: Electric Forces and Electric Fields
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Is it possible to have a zero electric field value between two positive charges along the line joining the two charges?
(A) Yes, if the two charges are equal in magnitude.
(B) Yes, regardless of the magnitude of the two charges.
(C) No, a zero electric field cannot exist between the two charges.
(D) cannot be determined without knowing the separation between the two charges
Ch15: Electric Charge and Electric Field (26 of 35)
Chapter 15: Electric Forces and Electric Fields
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Can electric field lines intersect in free space?
(A) Yes, but only at the midpoint between two equal like charges.
(B) Yes, but only at the midpoint between a positive and a negative charge.
(C) Yes, but only at the centroid of an equilateral triangle with like charges at each corner.
(D) No.
Ch15: Electric Charge and Electric Field (27 of 35)
Chapter 15: Electric Forces and Electric Fields
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If a solid metal sphere and a hollow metal sphere of equal diameters are each given the same charge, the electric field E midway between the center and the surface is
(A) greater for the solid sphere than for the hollow sphere.
(B) greater for the hollow sphere than for the solid sphere.
(C) zero for both.
(D) equal in magnitude for both, but one is opposite in direction from the other.
Ch15: Electric Charge and Electric Field (28 of 35)
Chapter 15: Electric Forces and Electric Fields
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The model of the atom shows a
(A) neutrally charged nucleus surrounded by both protons and electrons.
(B) nucleus consisting of both protons and electrons, surrounded by a cloud of neutrons
(C) nucleus consisting of both electrons and neutrons, surrounded by a cloud of protons.
(D) nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.
Ch15: Electric Charge and Electric Field (29 of 35)
Chapter 15: Electric Forces and Electric Fields
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Materials in which the electrons are bound very tightly to the nuclei are referred to as
(A) insulators.
(B) conductors.
(C) semiconductors.
(D) superconductors.
Ch15: Electric Charge and Electric Field (30 of 35)
Chapter 15: Electric Forces and Electric Fields
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Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which statement is correct?
(A) Sphere B remains neutral.
(B) Sphere B is now positively charged.
(C) Sphere B is now negatively charged.
(D) The charge on sphere B cannot be determined without additional information.
Ch15: Electric Charge and Electric Field (31 of 35)
Chapter 15: Electric Forces and Electric Fields
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A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves?
(A) They separate further.
(B) They move closer together.
(C) They are unaffected.
(D) cannot be determined without further information
Ch15: Electric Charge and Electric Field (32 of 35)
Chapter 15: Electric Forces and Electric Fields
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Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?
(A) There is no force between them since one is neutral.
(B) There is a force of repulsion between them.
(C) There is a force of attraction between them.
(D) The force is attractive if A is charged positively and repulsive if A is charged negatively.
Ch15: Electric Charge and Electric Field (33 of 35)
Chapter 15: Electric Forces and Electric Fields
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An electron and a proton are separated by a distance of 1.0 m. What happens to the size of the force on the proton if the electron is moved 0.50 m closer to the proton?
(A) It increases to 4 times its original value.
(B) It increases to 2 times its original value.
(C) It decreases to one-half its original value.
(D) It decreases to one-fourth its original value.
Ch15: Electric Charge and Electric Field (34 of 35)
Chapter 15: Electric Charge and Field
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Chapter 15: Electric Charge and Field
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Chapter 15: Electric Charge and Field
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Chapter 15: Electric Charge and Field
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