the ends of a coil is directly related to the speed with which a magnet is passed through a coil. (It is also directly related to the strength of the moving magnet and the number of turns in the coil.) 18. The direction of movement of the magnetic field determines the polarity of the induced voltage. Since the direction of the moving is continually reversing, the polarity of the induced voltage changes. 19. Generally, it is 120 volts. It may fluctuate a bit, however. 20. The voltage is reduced by using a step-down transformer. 21. 22. This is a step-up transformer. It increases the voltage. Solving Problems Section 17.1 1. 2. Doubling the current doubles the strength of the magnetic field. Tripling the current triples the strength of the magnetic field. Quadrupling the current quadruples the strength of the magnetic field. 3. 4. Answers are: a. Using a stronger magnet causes more current to flow. b. Moving the magnet toward the coil faster causes more current to flow. c. Reversing the magnet's direction causes the current direction to reverse. d. Adding more turns of wire cause more current to flow. e. Moving the pole of the magnet toward the coil will cause the current to flow in the opposite direction. (It will flow from left to right through the bulb.) f. If the two bulbs are in series, the current will decrease. If the two bulbs are in parallel, the current will increase. 5. A. Attract B. Repel C. Repel Section 17.2 6. The will spin in a counter-clockwise direction. 7. The inertia of the rotor will cause the north end of the permanent magnet to spin slightly past the electromagnet as its polarity changes, and the pole of the electromagnet closest to the rotor acquires a north pole orientation. For this to occur, the current must be flowing from A to B. Section 17.3 8. Answers are: a. = V1/V2 T1/T2 V) = (1000 V)/(50 V) V1/(120 = 2400 V V1 b. VV1/V2 = T1/T2 (120 V)/ = (1000 V)/(50 V) V2 = 6 V V2 9. Answers are: a. = V1/V2 T1/T2
the ends of a coil is directly related to the speed with which a magnet is passed through a coil. (It is also directly related to the strength of the moving magnet and the number of turns in the coil.) 18. The direction of movement of the magnetic field determines the polarity of the induced voltage. Since the direction of the moving is continually reversing, the polarity of the induced voltage changes. 19. Generally, it is 120 volts. It may fluctuate a bit, however. 20. The voltage is reduced by using a step-down transformer. 21. 22. This is a step-up transformer. It increases the voltage. Solving Problems Section 17.1 1. 2. Doubling the current doubles the strength of the magnetic field. Tripling the current triples the strength of the magnetic field. Quadrupling the current quadruples the strength of the magnetic field. 3. 4. Answers are: a. Using a stronger magnet causes more current to flow. b. Moving the magnet toward the coil faster causes more current to flow. c. Reversing the magnet's direction causes the current direction to reverse. d. Adding more turns of wire cause more current to flow. e. Moving the pole of the magnet toward the coil will cause the current to flow in the opposite direction. (It will flow from left to right through the bulb.) f. If the two bulbs are in series, the current will decrease. If the two bulbs are in parallel, the current will increase. 5. A. Attract B. Repel C. Repel Section 17.2 6. The will spin in a counter-clockwise direction. 7. The inertia of the rotor will cause the north end of the permanent magnet to spin slightly past the electromagnet as its polarity changes, and the pole of the electromagnet closest to the rotor acquires a north pole orientation. For this to occur, the current must be flowing from A to B. Section 17.3 8. Answers are: a. V1/V2 = T1/T2 V1/(120 V) = (1000 V)/(50 V) V1 = 2400 V b. VV1/V2 = T1/T2 (120 V)/ V2 = (1000 V)/(50 V) V2 = 6 V 9. Answers are: a. V1/V2 = T1/T2
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