Which pair of objects will have an attractive electric force?
Pair Object 1 Charge Object 2 Charge
A -2 -1
B -3 +1
C +3 +1
D +1 +2(1 point)
Responses
Pair B
Pair B
Pair C
Pair C
Pair D
Pair D
Pair A
9 answers
Pair C
How does the structure of atoms in a substance determine the substance’s conductivity?(1 point)
Responses
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
If an atom’s nucleus is positively charged, the substance is a good conductor.
If an atom’s nucleus is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is tightly bound to the nucleus, the substance is a good conductor.
Responses
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
If an atom’s nucleus is positively charged, the substance is a good conductor.
If an atom’s nucleus is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is positively charged, the substance is a good conductor.
If an atom’s outer shell of electrons is tightly bound to the nucleus, the substance is a good conductor.
If an atom’s outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor.
Students build four electromagnets and test them by picking up metal tacks. Here are their partial results.
12 coils 4 tacks
24 coils 9 tacks
36 coils 13 tacks
48 coils ? tacks
Which is the best prediction for the number of nails the electromagnet with 48 coils will pick up?(1 point)
Responses
12 tacks
12 tacks
16 tacks
16 tacks
13 tacks
13 tacks
20 tacks
12 coils 4 tacks
24 coils 9 tacks
36 coils 13 tacks
48 coils ? tacks
Which is the best prediction for the number of nails the electromagnet with 48 coils will pick up?(1 point)
Responses
12 tacks
12 tacks
16 tacks
16 tacks
13 tacks
13 tacks
20 tacks
16 tacks
How do electromagnets cause a maglev train to levitate above the track? (1 point)
Responses
Magnets in the track and magnets in the bottom of the train repel each other.
Magnets in the track and magnets in the bottom of the train repel each other.
Magnets in the track and magnets in the bottom of the train attract each other.
Magnets in the track and magnets in the bottom of the train attract each other.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.
Batteries provide electric energy to the electromagnets in the train.
Responses
Magnets in the track and magnets in the bottom of the train repel each other.
Magnets in the track and magnets in the bottom of the train repel each other.
Magnets in the track and magnets in the bottom of the train attract each other.
Magnets in the track and magnets in the bottom of the train attract each other.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.
Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train.
Batteries provide electric energy to the electromagnets in the train.
Magnets in the track and magnets in the bottom of the train repel each other.
Use the ray diagram for a lens to answer the question.
The illustration shows a candle as an object to the left of a concave lens beyond focus on the left. One ray from the candle falls on the lens parallel to the principal axis and is refracted through the focus on the right. Another ray from the candle falls at the optical center and is refracted undeviated. The two refracted rays meet at a point below the principal axis beyond focus on the right. An inverted image of the object smaller in size is formed.
Which of these best describes the type of lens shown in the ray diagram?
(1 point)
Responses
It shows a concave lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a concave lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a concave lens. For this type of lens, the image position depends on the object's position relative to the focus point.
It shows a concave lens. For this type of lens, the image position depends on the object's position relative to the focus point.
It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.
The illustration shows a candle as an object to the left of a concave lens beyond focus on the left. One ray from the candle falls on the lens parallel to the principal axis and is refracted through the focus on the right. Another ray from the candle falls at the optical center and is refracted undeviated. The two refracted rays meet at a point below the principal axis beyond focus on the right. An inverted image of the object smaller in size is formed.
Which of these best describes the type of lens shown in the ray diagram?
(1 point)
Responses
It shows a concave lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a concave lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.
It shows a concave lens. For this type of lens, the image position depends on the object's position relative to the focus point.
It shows a concave lens. For this type of lens, the image position depends on the object's position relative to the focus point.
It shows a convex lens. For this type of lens, the image position depends on the object's position relative to the focus point.
It shows a convex lens. For this type of lens, the image is always on the opposite side of the lens as the original object.