1. Review for 3 rd Quarter

2. Velocity is to speed as displacement is to (A) acceleration (B) momentum (C) time (D) distance

3. The diagram shows a resultant vector, R. Which diagram best represents a pair of component vectors, A and B, that would combine to form resultant vector R?

4. Which type of field is present near a moving electric charge? (A) an electric field, only (B) a magnetic field, only (C) both an electric field and a magnetic field (D) neither an electric field nor a magnetic field

5. A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper (A) may be negative or neutral (B) may be positive or neutral (C) must be negative (D) must be positive

6. The current traveling from the cathode to the screen in a television picture tube is 5.0 × 10 –5 ampere. How many electrons strike the screen in 5.0 seconds? (1C = 6.2 E 18) (A) 3.1 × 10 24 (B) 1.6 × 10 15 (C) 6.3 × 10 18 (D) 1.0 × 10 5

7. The diagram shows two identical metal spheres, A and B, separated by distance d. Each sphere has mass m and possesses charge q. Which diagram best represents the electrostatic force Fe and the gravitational force Fg acting on sphere B due to sphere A ?

8. The electric circuit consists of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2. At what value must the variable resistor be set to produce a current of 1.0 ampere through R1? (A) 6.0 Ω (B) 3.0 Ω (C) 9.0 Ω (D) 12 Ω

9. The diameter of a United States penny is closest to (A) 100 m (B) 10 –2 m (C) 10 –1 m (D) 10 –3 m

10. A 20-ohm resistor and a 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the equivalent resistance of the circuit? (A) 10. Ω (B) 25 Ω (C) 12 Ω (D) 50. Ω

11. A 20-ohm resistor and a 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the current reading of the ammeter? (A) 1.0 A (B) 0.40 A (C) 0.60 A (D) 0.20 A

12. A 20-ohm resistor and a 30-ohm resistor are connected in parallel to a 12-volt battery as shown. An ammeter is connected as shown. What is the power of the 30.-ohm resistor? (A) 4.8 W (B) 12 W (C) 30 W (D) 75 W

13. Which graph best represents the relationship between the magnitude of the electric field strength, E, around a point charge and the distance, r, from the point charge?

14. Several pieces of copper wire, all having the same length but different diameters, are kept at room temperature. Which graph best represents the resistance, R, of the wires as a function of their cross-sectional areas, A ?

15. If the magnitude of the gravitational force of Earth on the Moon is F, the magnitude of the gravitational force of the Moon on Earth is (A) smaller than F (B) larger than F (C) equal to F

16. An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The leaf electroscope is positively charged. As a positively charged glass rod is brought near the knob of the electroscope, the separation of the electroscope leaves will (A) decrease (B) increase (C) remain the same

17. In the circuit diagram, what are the correct readings of voltmeters V1 and V2? (A) V1 reads 2.0 V and V2 reads 4.0 V (B) V1 reads 4.0 V and V2 reads 2.0 V (C) V1 reads 3.0 V and V2 reads 3.0 V (D) V1 reads 6.0 V and V2 reads 6.0 V

18. : F = k e q 1 q 2 Gravity Force F == G m 1 m 2 1 C = 6.24 E18 d 2 d 2 d 2 d 2 k e = 9E9 Nm 2 G = 6.67E-11 Nm 2 1 amp = 1C/s C 2 kg 2 C 2 kg 2 Electric Potential V = Joules/Coulomb Electric Field E = k e q (N/C) d 2 d 2 e -1 mass = 9.11E-31 kge -1 charge = -1.60E-19 Proton mass = +1.67E-27 kg Proton charge = 1.60E-19 P = IVV = IR#turns (amperage) = #turns (amperage) 18

19. A point charge of +3.0 E-7 coulomb is placed 2.0 E-2 meter from a second point charge of +4.0 E-7 coulomb. The magnitude of the electrostatic force between the charges is A. 2.7 N B. 5.4 E-2 N C. 3.0 E-10 N D. 6.0 E-12 N 19

20. An apple weighing 1 Newton on the surface of Earth has a mass of approximately (A) 1×10 –1 kg (B) 1×10 1 kg (C) 1×10 0 kg (D) 1×10 2 kg

21. Which diagram best represents magnetic flux lines around a bar magnet?

22. What is the total resistance of the circuit segment? (A) 1.0  (B) 9.0  (C) 3.0  (D) 27 

23. Which circuit diagram shows voltmeter V and ammeter A correctly positioned to measure the total potential difference of the circuit and the current through each resistor?

24. What is the total electrical energy used by a 1500-watt hair dryer operating for 6.0 minutes? (1) 4.2 J (2) 250 J (3) 9.0×10 3 J (4) 5.4×10 5 J

25. Moving 2.5 × 10 –6 coulomb of charge from point A to point B in an electric field requires 6.3 × 10 –4 joule of work. The potential difference between points A and B is approximately (A) 1.6 × 10 –9 V (B) 4.0 × 10 –3 V (C) 2.5 × 10 2 V (D) 1.0 × 10 14 V

26. Three neutral metal spheres, x, y, and z, are in contact and on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it? A. B. C. D. A. B. C. D.

27. When a neutral metal sphere is charged by contact with a positively charged glass rod, the neutral sphere (A) loses electrons (B) loses protons (C) gains electrons (D) gains protons

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29. When a neutral metal sphere is charged by induction with a positively charged glass rod, the neutral sphere (A) loses electrons (B) loses protons (C) gains electrons (D) gains protons

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31. If 10 coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is (A) 0.50 A (B) 2.0 A (C) 15 A (D) 50. A

32. As the potential difference across a given resistor is increased, the power expended in moving charge through the resistor (A) decreases (B) increases (C) remains the same

33. An electric iron operating at 120 volts draws 10 amperes of current. How much heat energy is delivered by the iron in 30 seconds? (A) 3.0 × 10 2 J (B) 1.2 × 10 3 J (C) 3.6 × 10 3 J (D) 3.6 × 10 4 J

34. One watt is equivalent to one (A) Nm (B) Js (C) N/m (D) J/s

35. The mass of a high school football player is approximately (A) 10 0 kg (C) 10 2 kg (B) 10 1 kg (D) 10 3 kg

36. What is the reading on ammeter A? (A) 1.3 A (C) 3.0 A (B) 1.5 A (D) 0.75 A

37. In the diagram above, proton p, neutron n, and electron e are located as shown between two oppositely charged plates. The magnitude of acceleration will be greatest for the (A) neutron, because it has the greatest mass (B) neutron, because it is neutral (C) electron, because it has the smallest mass (D) proton, because it is farthest from negative plate

38. Two protons are located one meter apart. Compared to the gravitational force of attraction between the two protons, the electrostatic force between the protons is (A) stronger and repulsive (B) weaker and repulsive (C) stronger and attractive (D) weaker and attractive

39. The diagram shows a bar magnet. Which arrow best represents the direction of the needle of a compass placed at point A? (A) ↑ (C) → (B) ↓ (D) ←

40. The diagram represents the electric field surrounding two charged spheres, A and B. What is the sign of the charge of each sphere? (A) Sphere A is positive and sphere B is negative. (B) Sphere A is negative and sphere B is positive. (C) Both spheres are positive. (D) Both spheres are negative.

41. What is a machine that produces electrical current by rotating a coil within a stationary magnetic field? A. Generator B. Transformer C. Light bulb D. Motor

42. What is a machine that produces rotation of a coil within a stationary magnetic field by an electrical current? A. Generator B. Transformer C. Light bulb D. Motor

43. According to Faraday’s law the induce voltage in a coil is ______ to the product of number of loops A. Not related B. Inversely proportional C. Proportional

44. For a transformer: The primary voltage is 6000 volts and the primary amperage is 2 amps, the power is _____ watts.

45. For a transformer: If the primary voltage is 6000 volts and the primary amperage is 2 amps, the power is _____ watts in the secondary.

46. For a transformer: If the primary voltage is 6000 volts and the primary amperage is 2 amps with 50:1 ratio, what is the voltage in the secondary?

47. For a transformer: If the primary voltage is 6000 volts and the primary amperage is 2 amps with 50:1 ratio, what is the amperage in the secondary?

48. For a transformer:For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps.The primary has a voltage of 6000 volts and amperage is 200 amps. What is the power in the primary?What is the power in the primary? 48

49. For a transformer:For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps.The primary has a voltage of 6000 volts and amperage is 200 amps. The secondary has a voltage of 480,000 volts and amperage is 1.5 amps.The secondary has a voltage of 480,000 volts and amperage is 1.5 amps. What is the power in the secondary?What is the power in the secondary? 49

50. For a transformer:For a transformer: The primary has a voltage of 6000 volts and amperage is 200 amps.The primary has a voltage of 6000 volts and amperage is 200 amps. The secondary has a voltage of 480,000 volts and amperage is 1.5 amps.The secondary has a voltage of 480,000 volts and amperage is 1.5 amps. What is the percent efficiency of the transformer?What is the percent efficiency of the transformer? 50

51. What is a device used for changing the potential difference (voltage) of alternating currents? A. An ammeter. B. A voltmeter. C. A direct current. D. A transformer. E. Not possible

52. What is a device used for changing the current (amperage) of alternating currents? A. An ammeter. B. A voltmeter. C. A direct current. D. A transformer. E. Not possible

53. What is a device used for changing the power (watts) of alternating currents? A. An ammeter. B. A voltmeter. C. A direct current. D. A transformer. E. Not possible