Physics 102 Spring 2006: Exam #1 Multiple-Choice Questions
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1 Last Name: First Name: Physics 102 Spring 2006: Exam #1 Multiple-Choice Questions 1. Consider two isolated spherical conductors each having net charge Q. The spheres have radii a and b, where b > a. Which sphere has the higher potential? (Take the zero of potential to be at.) (a) the sphere of radius a. (b) the sphere of radius b. (c) they have the same potential. (d) more information is needed to answer the question. 2. Rank the work required to assemble the charge distributions below from least to greatest. In all cases, the separation between the middle charge and the outer charges are the same. Use a reference of zero potential energy at. (a) A < B < C = D (b) C = D < B < A (c) A < B = C = D (d) B = C = D < A (e) D < C = B < A (A) (B) (C) +q +q +q +q -q +q (D) +q +q -q -q +q -q 3. A positive charged particle traveling with a velocity v in an electric field E experiences a force F that must be (a) parallel to v. (b) parallel to E. (c) perpendicular to v. (d) parallel to v E. (e) perpendicular to E.
2 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page 4 For questions 4 and 5, refer to the graph below, depicting the potential on the x-axis as a function of x V x x Which of the charge configurations depicted below would give rise to the potential shown above? 5. What is the x component of the electric field for points on the x-axis given by the potential depicted above?
3 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page 5 6. Consider a metal cylindrical shell of outer radius r c and inner radius r b which is concentric with a metal wire of radius r a. The linear charge density of the wire is +λ and linear charge density of the cylinder is λ. Which of the following statement(s) is (are) true? I. The potential difference between r c and r b is zero. II. The potential difference between r b and r a is zero. III. The potential difference between a point outside the cylinder and r c is zero. IV. The electric field between a point outside the cylinder and r c is zero. ra rb rc (a) only I and IV are true (b) only II and IV are true (c) only I and III are true (d) only II, III and IV are true (e) only I, III, and IV are true 7. What is the direction of the electric field of the charge distribution below at the points 1, 2, and 3? (Note: points 1 and 2 are on the line bisecting the segment connecting the charges.) q -q (A). 1: 2: 0 3: (B). 1: 2: 3: 0 (C). 1: 2: 3: (D). 1: 0 2: 0 3: (E). 1: 2: 0 3:
4 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page 6 8. A net charge of +Q is transferred to a spherical conducting shell of inner radius a and outer radius b. A point charge 10 q is placed in the center of the shell (as shown below). What is the charge density on the outside of the conducting shell? b a (a) σ = 10q/4 π b 2. (b) σ = Q/4 π b 2. (c) σ = (Q 10q)/4 π b 2. (d) σ = (Q + 10q)/4 π b 2. (e) σ = (10q Q)/4 π b Charges +Q and +4Q are situated as shown below. The net electric field is zero nearest which point? (a) A. (b) B. (c) C. (d) D. (e) E. +4Q +Q A B C D E
5 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page An electron enters a region which is known to have a uniform electric field. If the electron leaves the region a distance d lower then it entered the region, as shown below, which vector bests represents the electric field vector in the specified region? e - v0 d e - vf (a) (b) (c) (d) X (directed into the page) (e) (directed out of the page) 11. A charge q = 6Q rests inside a pyramid as shown in the figure below. The pyramid has a lateral base perimeter of a units and a lateral base height of b units. What is the total electric flux through the pyramid? (a) Φ = 3 k Q b 2 (b) Φ = 6 Q ε 0 (c) Φ = 6 Q a2 b 2 ε 0 (d) Φ = 3 Q a2 b 2 ε 0 (e) Φ = 6 k Q a 2-6Q
6 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page The figure below depicts four charges, three with positive charge +q and one with negative charge q, placed at the corners of a square. Which arrow below most accurately depicts the force on a negatively charged particle at the center point C? +q +q C +q -q (a) (b) (c) (d) (e) Three equal charges are placed at the corners of an equilateral triangle. Which of the graphs below correctly depicts the equally-spaced equipotential surfaces in the plane of the triangle? (All graphs have the same scale.) (a) A. (b) B. (c) C. (d) D. (e) E.
7 February 16, 2006 PHYS102 Exam #1 - Multiple-Choice Section Page Positive charge +Q is uniformly distributed on the upper half of a semicircular rod and negative charge Q is uniformly distributed on the lower half, as shown in the figure below. Which arrow bests indicates the direction of the electric field at point P, then center of the semicircle? +Q P -Q (a) (b) (c) (d) (e) A point charge Q is held fixed in place and another point charge q is brought closer to it moving at constant velocity. Which of the following statement(s) is (are) true? I. The electrostatic potential energy of q increases as it is brought closer to Q if q and Q are of the same sign. II. The work done by the electrostatic force is positive if q and Q are of the same sign. III. The work done by an external force to bring q closer to Q is positive if q and Q are of the opposite sign. IV. The work done by an external force to bring q closer to Q is negative if q and Q are of the opposite sign. (a) I only. (b) II only. (c) I and II only. (d) I and IV only. (e) II and III only.
8 Last Name: key First Name: key Physics 102 Spring 2006: Exam #1 Multiple-Choice Answers A B C D E 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X 9 X 10 X 11 X 12 X 13 X 14 X 15 X
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