Exam 1PHYS 102Spring 2013


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1 ame: Class: Date: Exam 1PHYS 102Spring 2013 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A metallic object holds a charge of C. What total number of electrons does this represent? a b c d Which of the following best characterizes electrical insulators? a. they have a high tensile strength b. electric charges move freely within the material c. they are good heat conductors d. charges in the material don't move 3. Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change? a. 1/4 b. 2 c. 4 d. 1/2 4. In a thundercloud there may be an electric charge of +40 C near the top of the cloud and 40 C near the bottom of the cloud. These charges are separated by about 2.0 km. What is the electric force between these two sets of charges? a N b N c N d N 5. Electric field is dimensionally equivalent to which of the following? a. N m/c b. N/C 2 c. N/C d. N m 2 /C 2 1
2 ame: 6. Charges of 4.0 µc and 2.0 µc are placed at two corners of a right triangle as shown. What is the magnitude of the electric field felt by the 2.0µC charge? a N/C b N/C c. 700 N/C d N/C 7. For the previous problem, what is the direction of the electric field at the position of the 2.0 µc charge? a. 53 above the x axis c. 137 from the +x axis b. 37 below the +x axis d. 37 above the x axis 8. This figure shows two charges and their electric field lines. If the charge on the right has a magnitude of 10 µc, what is the sign and magnitude of the left charge? a µc d. 4 µc b. +10 µc e. 10 µc c. +6 µc 2
3 ame: 9. Consider this configuration of charges. Which vector best represents the net force acting on the bottom charge? a. a d. d b. b e. e c. c 10. A proton is accelerated by a constant electric field of magnitude 220 N/C; the proton is moving in the same direction as the electric field. What is the proton s velocity after 1x106 s? a. 2.1x10 4 m/s c. 2.1x10 10 m/s b m/s d. 3.5x1023 m/s 11. A capacitor consists of 2 metal plates with an area of 0.3 m 2 each. The plates are separated by a distance of 1x106 m. A piece of paper is between the two plates; this paper has a dielectric constant of 1.8. What is the capacitance of the capacitor? a. 2.7 µf c. 4.0 µf b. 1.5 µf d. 4.8 µf 3
4 ame: 12. What is the equivalent capacitance of this circuit? 2.0 µf 2.0 µf 1.0 µf 12 V a. 2.0 µf c. 10 µf b. 5.0 µf d. 0.8 µf 13. For the circuit in the previous figure, what is the charge on the left 2.0 µf capacitor? a. 12 µc c. 24 µc b. 3.0 µc d. 6.0 µc 14. Two charges are arranged on the vertices of this equilateral triangle as shown. If Q=2.0 µc, what is the potential at the top of the triangle (where the smiley face is)? a. 12 V c. 36,000 V b. 144,000 V d. 18,000 V 4
5 ame: 15. Two charges are arranged on the vertices of this equilateral triangle as shown in the previous figure. If Q=2.0 µc, how much work would be required to bring a charge of value Q (2 µc) from a very large distance away to the place at the top of the triangle (where the smiley face is)? a J c. 1.8x10 10 J b J d J 16. Consider this circuit. All three capacitors are identical. What is the voltage across C 1? C 2 C 1 C 3 12 V a. 4 V c. 6 V b. 12 V d. 8 V 5
6 ame: 17. This diagram shows a collection of charges. At which point is the potential equal to zero? a. a d. d b. b e. e c. c 18. At what point is the potential greatest? a. A c. both the same b. B d. it depends on the magnitude of the charge 6
7 ame: 19. What is the equivalent capacitance of this arrangement of capacitors? a. 8.7 µf c. 18 µf b. 12 µf d. 3.0 µf 20. Two pieces of copper wire are the same diameter. The length of wire A is twice that of wire B. How do their resistances compare? a. R A =R B d. R A =2R B b. R A =½R B e. R A =4R B c. R A =¼R B 21. Consider this circuit. What is the current through the resistor? a. 4 A c. 36 A b A d. 3 A 22. When you apply a potential of 3 V to a particular electrical device, the current in 2 A. When you apply 6V, the current is 4 A. Is this device Ohmic or NonOhmic? a. Ohmic c. Neither b. NonOhmic d. Not enough information 7
8 ame: 23. Which of these has the greater current, a incandescent light bulb (60 W) or a bathroom heater (1000 W)? a. heater c. both the same b. bulb 24. A 50Ω resistor is hooked up to a power supply of 150 V. What is the power dissipated across the resistor? a W c W b. 450 W d. 3 W 25. Bubble A for this answer. a. A c. C b. B d. D 8
9 ID: A Exam 1PHYS 102Spring 2013 Answer Section MULTIPLE CHOICE 1. ANS: B PTS: 1 2. ANS: D PTS: 1 3. ANS: C PTS: 1 4. ANS: C PTS: 1 DIF: 2 TOP: 15.3 Coulomb's Law 5. ANS: C PTS: 1 DIF: 1 TOP: 15.4 The Electric Field 6. ANS: D PTS: 1 DIF: 3 TOP: 15.4 The Electric Field 7. ANS: D PTS: 1 8. ANS: D PTS: 1 9. ANS: B PTS: ANS: A PTS: ANS: D PTS: ANS: A PTS: ANS: A PTS: ANS: C PTS: ANS: B PTS: ANS: D PTS: ANS: B PTS: ANS: A PTS: ANS: D PTS: ANS: D PTS: ANS: A PTS: ANS: A PTS: ANS: A PTS: ANS: B PTS: ANS: A PTS: 1 1
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