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Electricity Review

Electricity Review. 1) A neutral piece of fur is rubbed along a neutral plastic rod. The rod gains a charge of +4.0 m C. Which of the following is true?. The fur gains a charge of +4.0 m C The protons moved from the rod to the fur. The fur has gained electrons. The rod and fur now repel.

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Electricity Review

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  1. Electricity Review

  2. 1) A neutral piece of fur is rubbed along a neutral plastic rod. The rod gains a charge of +4.0 mC. Which of the following is true? • The fur gains a charge of +4.0 mC • The protons moved from the rod to the fur. • The fur has gained electrons. • The rod and fur now repel. • This is an example of charging by contact.

  3. 2. The neutral rod gained a charge of +4.0 mC. Which of the following statements is true? A) The rod lost 2.5*1013 electrons • The rod lost 2.5*1019 electrons • The rod lost 4.0*10-6 electrons • The rod lost 4.0*106 electrons • The rod lost 6.4*10-25 electrons

  4. 3. Two identical conducting spheres are charged. Sphere A has a charge of +2μC and sphere B has a charge of -8μC. The two spheres touch each other. Which best describes what happened. A) Negative charge moved from sphere B to sphere A until sphere B had a net charge of zero. B) Positive charge moved from Sphere A to sphere B until sphere A had a net charge of zero. C) Negative charge moved from sphere B to sphere A until the two spheres had equal charge. D) Positive charge moved from sphere A to sphere B until the two spheres had equal charge. E) Negative charge moved from sphere B to sphere A and positive charge moved from sphere A to sphere B until the two spheres had equal charge.

  5. 4. Two identical conducting spheres are charged. Sphere A has a charge of +2.00μC and sphere B has a charge of -8.00μC. The two spheres touch each other and then are pulled apart. To make sphere A neutral you should: A) Add 3.75 x 1013 electrons B) Remove 3.75 x 1013 electrons C) Add 1.88 x 1013 electrons D) Remove 1.88 x 1013 electrons E) Do nothing – the sphere is already neutral.

  6. 5. Three charges are aligned as shown below.What is the magnitude of the force on the +2.0 mC charge? -3.0 mC +2.0 mC +4.0 mC • 1.4 N • 0.80 N • 0.60 N • 0.20 N • 0 N 0.30 m 0.30 m

  7. 6. Two charges are aligned as shown below.What is the electric field at point X? -3.0 mC Point X +4.0 mC • 0 N/C • 1.0*105 N/C to the left • 3.0*105 N/C to the left • 4.0*105 N/C to the left • 7.0*105 N/C to the left 0.30 m 0.30 m

  8. 7. Which of the following statement is false? • A positive charge experiences a force in the direction of the electric field. • A positive charge moving against the electric field gains electric potential energy. • Electric field lines never cross. • Electric field lines start at a negative or infinity. • The density of electric field lines is related to the strength of the electric field

  9. 8. A parallel plate capacitor has an electric field of 0.50 N/C in the direction shown below.Which is the positive of the two plates? • The top plate. • The bottom plate. • It depends on the type of charge placed between the plates. • It depends on the distance between the plates. • They both have the same charge. E

  10. 9. A parallel plate capacitor has an electric field of 0.50 N/C in the direction shown below.Where would a charge have the highest EPE due to the electric field? • At the top plate. • At the bottom plate. • Directly between the plates. • It depends on the type of charge placed between the plates. • The charge has no EPE anywhere between the plates E

  11. 10. A parallel plate capacitor has an electric field of 0.50 N/C in the direction shown below.What charge should a 2.5*10-5 kg drop of oil have to stay suspended between the plates? (Include gravity) • +5.0*10-5 C • +5.0*10-4 C • -5.0*10-5 C • -5.0*10-4 C • -1.3*10-4 C E

  12. 11. The resistance of a bagel toaster is 15 Ω. To prepare a bagel, the toaster is plugged into a standard 120-V outlet.How much power does the toaster consume? • 8.0 W • 15 W • 120 W • 960 W • 1800 W

  13. 12. The resistance of a bagel toaster is 15 Ω. To prepare a bagel, the toaster is plugged into a standard 120-V outlet.Find the energy consumed in the 1.5 minutes it takes to toast a bagel. • 1.4 J • 180 J • 1400 J • 11000 J • 86000 J

  14. 13. The resistance of a bagel toaster is 15 Ω. To prepare a bagel, the toaster is plugged into a standard 120-V outlet.How much charge passes through the toaster in 1.5 minutes? • 12 C • 120 C • 720 C • 960 C • 86000 C

  15. 14. You are given two resistors with different resistances and a battery. Indicate which circuit arrangement best answers the question. Which arrangement has the greatest total resistance? • Series • Parallel • Same for both

  16. 15. You are given two resistors with different resistances and a battery. Indicate which circuit arrangement best answers the question. Which arrangement has the same current in each resistor? • Series • Parallel • Same for both

  17. 16. You are given two resistors with different resistances and a battery. Indicate which circuit arrangement best answers the question.Which arrangement draws the greatest current from the battery? • Series • Parallel • Same for both

  18. 17. You are given two resistors with different resistances and a battery. Indicate which circuit arrangement best answers the question. Which arrangement has the same voltage drop across each resistor? • Series • Parallel • Same for both

  19. 18. You are given two resistors with different resistances and a battery. Indicate which circuit arrangement best answers the question. Which arrangement uses up the battery faster? • Series • Parallel • Same for both

  20. 19. The current in a 47-Ω resistor is 0.12 A. This resistor is in series with a 28-Ω resistor, and the series combination is connected across a battery. What is the battery voltage? • 5.6 V • 3.4 V • 9.0 V • 4.5 V

  21. The current in a series circuit is 15.0 A. When an additional 8.00-Ω resistor is inserted in series, the current drops to 12.0 A. What is the resistance in the original circuit? • 8.00-Ω • 24.0-Ω • 32.0-Ω • 40.0-Ω

  22. Two identical light bulbs are connected to identical batteries in two different ways. In method A the bulbs are connected in parallel, and the parallel combination is connected between the one battery's terminals. In method B the bulbs are connected in series, and the series combination is connected between the other battery's terminals. What is the ratio of the power supplied by the battery in method A to the power supplied in method B? • ¼ • 4 • ½ • 1

  23. Two resistors, 42.0 and 64.0 Ω, are connected in parallel. The current through the 64.0-Ω resistor is 3.00 A. Determine the current in the other resistor. • 1.97 A • 3.00 A • 4.57 A • 4.97 A • 7.57 A

  24. 23. Two resistors, 42.0 and 64.0 Ω, are connected in parallel. The current through the 64.0-Ω resistor is 3.00 A. What is the total power supplied to the two resistors? • 192 W • 318 W • 576 W • 877 W • 1450 W

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