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Name: Last First Name: Physics 102 Spring 2006: Final Exam Multiple-Choice Questions For questions 1 and 2, refer to the graph below, depicting the potential on the x-axis as a function of x Vx 60 40 20 3 2 1 20 40 60 1. Which of the charge con gurations depicted below would give rise to the potential shown above? 1 2 3 x 2. What is the x component of the electric eld for points on the x-axis given by the potential depicted above? May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 6 3. In each of the pictures below, the arrows represent the electric eld lines and the distance between A and B is the same. Assuming the electric eld is the same at point A in all cases (1 - 3), list in order from least to greatest the potential di erence VAB V (B) V (A). $ % $ % $ % (A) case(1) < case(2) < case(3). (B) case(2) < case(3) < case(1). (C) case(3) = case(1) < case(2). (D) case(2) < case(3) = case(1). (E) case(3) < case(1) < case(2). 4. The current through an in nitely long solenoid is increased linearly as a function of time in the direction indicated in the gure below. The gure below represents a cross section of the solenoid indicating the direction of the magnetic eld. The electric eld inside the solenoid is (A) in the form of counter-clockwise rotating circles centered on the axis of the solenoid. (B) in the form of clockwise rotating circles centered on the axis of the solenoid. (C) parallel to the axis of the solenoid. (D) radially directed outward from the center on the axis of the cylinder. (E) zero. 5. The switch in the circuit below has been opened a very long time. What is the current through resistor R2 immediately after the switch is closed? (A) V / R1 . (B) V R1 +R2 R1 R2 I R2 . (C) V / (R1 + R2 ). (D) V / R2 . (E) 0. R1 V L May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 7 6. Consider four very long wires carrying equal steady currents going into or out of the page as indicated in the gure below. Rank the line integral of the magnetic eld B dl (from greatest to least) taken in the clockwise direction. (A) A > C > B > D (B) D > B > C > A (C) A = C > B = D (D) A = B > C = D (E) C = D > A = B loop A loop D x x x loop C loop B 7. A capacitor is fully charged to 24 V and then connected between points A and B in the gure below, with its positive plate located at A. What is the current through the 2 k resistor immediately after the capacitor is connected? 1 k (A) 0 mA. (B) 2 mA. (C) 4 mA. (D) 8 mA. (E) 12 mA. A 6V 2 k B May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 8 Refer to the circuit below for Questions 8 - 10. At time t = 0, the switch is closed. R1 V C1 R2 8. The current, I0 , through resistor R1 at t = 0 is (A) I0 = V /(R1 + R2 ). (B) I0 = V /R1 . (C) I0 = V /R2 . (D) 0. 9. After the switch has been closed for a very long time, the potential di erence, VC , across the capacitor is (A) VC = V . (B) VC = V (R1 /R2 ). (C) VC = V (R2 /R1 ). (D) VC = V ( R1R1 2 ). +R (E) VC = V ( R1R2 2 ). +R 10. Which of the following graphs best represents the behavior of the charge on the capacitor as a function of time? Q(t) Q(t) (A) (B) TIME TIME Q(t) Q(t) (C) (D) TIME TIME May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 9 11. The gure below shows an open loop of wire in a magnetic eld. There are no charged particles near the loop. Charge has piled up at the loop gap with the polarity indicated in the gure. What can be concluded? (A) The magnetic eld strength is static. (B) The magnetic eld strength is increasing. (C) The magnetic eld strength is decreasing. (D) There can be no charge piled up at the loop gap since this is not a closed loop. (E) More information is needed to answer the question. + - 12. A loop of wire carries a constant current I in the clockwise direction when viewed from the right as shown below. A very long straight wire passes near the loop, also carrying constant current I indicated in the gure. The loop will experience a torque in what direction? B I C A I Side View B Head on view I (out of page) I A (A) The loop experiences a net torque about axis A. (B) The loop experiences a net torque about axis B. (C) The loop experiences a net torque about axis C. (D) The loop experiences no net torque. 13. Charges +4Q and Q are situated as shown below. The net electric eld is zero nearest which point? +4Q A (A) A. (B) B. (C) C. (D) D. (E) E. -Q C D E B May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 10 14. A neutral particle (labeled 1) in the gure below is moving with constant speed in a region of constant magnetic eld (the direction is indicated in the gure). At a given instant in time, particle 1 decays into two di erent particles (labeled 2 and 3). The two particles follow paths indicated the in gure such that initially they have the same radius of curvature. Which of the following statement(s) is (are) true? X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 2 X X X X X X X 1 X X X X 3 I. The magnitude of momentum of particle 2 is less than the magnitude of momentum of particle 3. II. The magnitude of momentum of particle 2 is the same as the magnitude of momentum of particle 3. III. The magnitude of momentum of particle 2 is greater than the magnitude of momentum of particle 3. IV. Particle 2 is negatively charged and particle 3 is positively charged. V. Particle 2 is positively charged and particle 3 is negatively charged. VI. The speed of particle 2 is increasing. VII. The speed of particle 2 is decreasing. (A) Only I, IV, and VI are correct. (B) Only II, IV, and VII are correct. (C) Only II, V, VII are correct. (D) Only I, V, and VI are correct. (E) Only I, V, and VII are correct. May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 11 15. The gure below shows two arcs of equal radius centered about point P. Positive charge +Q is uniformly distributed on a the upper arc and negative charge Q is uniformly distributed on the lower arc, as indicated in the gure below. Which arrow bests indicates the direction of the electric eld at point P, the center of the arcs? (A) (B) (C) (D) (E) 0 +Q P -Q 16. A solenoid has an inductance L0 . A second solenoid is identical to the rst except that its geometrical dimensions have been magni ed by a factor of two and the total number of loops remains the same. What is the ratio of the inductance of the magni ed (L1 ) solenoid to the original solenoid (i.e., what is L1 /L0 )? (A) 4. (B) 2. (C) 1. (D) 1/2. (E) 1/4. 17. Doubling which of the following quantities quadruples the energy stored in an ideal solenoidal inductor: I. current. II. length. III. radius. IV. loops per length. (A) Only I and II. (B) Only I and III. (C) Only I, II and III. (D) Only I, III and IV. (E) All four. May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 12 For Questions 18 - 20 refer the gure below. Originally there were eight negative charges held equally around a circle of radius R. One of the charges is removed and the charge con guration is illustrated in the gure below. -q -q -q -q P -q -q -q 18. What is the magnitude of the electric eld at the center of the circle? (A) 0. (B) (1/8) k q/ R2 . (C) (7/8) k q/ R2 . (D) k q/ R2 . (E) 7 k q/ R2 . 19. What is the direction of the electric eld at the center of the circle? (A) (B) (C) (D) (E) 0 20. What is the electric potential at the center of the circle? (Assuming the electric potential approaches zero at a in nite distance away from the center of the circle). (A) 0. (B) -(1/8) k q/ R. (C) -(7/8) k q/ R. (D) -k q/ R. (E) -7 k q/ R. May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 13 21. Two transformers are arranged as shown below and the power cord is plugged into a 120 V AC voltage source. The number of turns N2 is twice as large as the number of turns N1 . If 1 Amp of current is measured in the intermediate wire (the wire containing N2 turns), what is the current through the light-bulb? (A) 1/4. (B) 1/2. (C) 1. (D) 2. (E) 4. N 1 9 N 2 N 1 22. The leads of an AC-generator with angular frequency and peak voltage Vp are connected across a capacitor with capacitance C and reactance XC = 1/ C. What is the average power < P > dissipated by the capacitor? (A) (B) (C) (D) (E) <P <P <P <P <P >= 0. >= V 2 /( 2 XC ). >= V 2 /(2 XC ). >= V 2 /(XC ). >= 2 V 2 /(XC ). 23. Two resistors and an inductor are connected across an AC voltage source as shown below. As the frequency of the AC voltage source increases, the RMS current in the resistor labeled R2 (A) increases. (B) remains the same. (C) decreases. R1 L R2 24. Three very long wires carrying constant current of equal magnitude and directions as indicated in the gure below are held in place. Which arrow best represents the direction of the force experienced by the wire located at the point (x = 0, y = b)? y (A) (B) (C) (D) (E) 0 I1 I2 a X b a I3 X x May 3, 2006 PHYS102 Final Exam - Multiple-Choice Section Page 14 25. Four positively charged particles with equal charge, +Q are situated near a very long wire carrying a negative uniform linear charge density, . A sphere of radius R is centered about point P indicated in the gure below. The electric ux, E = E dA through the sphere is: (A) E = 0. (B) E = (C) E = (D) E = (E) E = 8Q R2 4 R2 . 0 2Q 2 R . 0 2 R 0 . 2Q 0 . +Q P +Q +Q +Q R Last Name: First Name: Physics 102 Spring 2006: Final Exam Multiple-Choice Answers ABCDE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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