 June 1997, Part 5
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81. Two hollow-core solenoids, A and B, are connected by a wire, as shown in the diagram below. Two bar magnets, 1 and 2, are suspended just above the solenoids. If the north pole of magnet 1 is dropped through solenoid A, the south pole of magnet 2 will simultaneously be

1. attracted by a magnetic force toward solenoid B
2. repelled by a magnetic force away from solenoid B
3. repelled by an electric force away from solenoid B
4. unaffected by solenoid B
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82. Which device can be used to increase the voltage from a source of direct current?
1. electroscope
2. mass spectrometer
3. induction coil
4. generator
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83. The graph below shows induced potential difference versus time for the rotating armature of a generator. What is the frequency of armature rotation?

1. 10 Hz
2. 20 Hz
3. 40 Hz
4. 60 Hz
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84. The transformer on a power pole steps down the voltage from 10,800 volts to 120. volts. If the secondary coil contains 360 turns, how many turns are on the primary?
1. 30
2. 90
3. 3600
4. 32,400
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Note that question 85 has only three choices.

85. An electron is located between a pair of oppositely charged plates. As the electron approaches the positive plate, the kinetic energy of the electron

1. decreases
2. increases
3. remains the same 1 2 3 4
86. In the diagram below, a source produces a light that is reflected from a plane mirror. To an observer at point O, the light appears to originate from point

1. A
2. B
3. C
4. D
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87. A spherical mirror that forms only virtual images has a radius of curvature of 0.50 meter. The focal length of this mirror is
1. -0.25 m
2. +0.25 m
3. -0.50 m
4. +0.50 m
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88. A spherical concave mirror is used in the back of a car headlight. Where must the bulb of the headlight be located to produce a parallel beam of reflected light?
1. between the principal focus and the mirror
2. beyond the center of curvature of the mirror
3. at the principal focus of the mirror
4. at the center of curvature of the mirror

Base your answers to questions 89 through 91 on the information and diagram below.  An object is located at the center of curvature C of a concave spherical mirror with principal focus F. The focal length of the mirror is 0.10 meter. 1 2 3 4
89. At what distance from the mirror is the image located?
1. 0.10 m
2. 0.20 m
3. 0.30 m
4. 0.40 m
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90. At what distance from the mirror could the object be placed to produce a virtual image of the object?
1. 0.05 m
2. 0.10 m
3. 0.30 m
4. 0.50 m
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Note that question 91 has only three choices.

91. As the object is moved from point C toward point F, the size of the image

1. decreases
2. increases
3. remains the same

Base your answers to questions 92 and 93 on the information below.

A crown glass converging lens has a focal length of 0.10 meter.

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92. Which cross-sectional diagram best represents this lens? 1 2 3 4
93. An object is placed 0.30 meter from the lens. How far from the lens will an image of the object be formed?
1. 0.30 m
2. 0.20 m
3. 0.15 m
4. 0.10 m
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94. An object 0.080 meter high is placed 0.20 meter from a converging (convex) lens. If the distance of the image from the lens is 0.40 meter, the height of the image is
1. 0.010 m
2. 0.040 m
3. 0.080 m
4. 0.16 m
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95. A diverging (concave) lens can form images that are
1. virtual, only
2. inverted, only
3. either virtual or real
4. either inverted or erect 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4  Additional Tests
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