Answers25-26 TX-Physics B-CRLab: Electromagnetic Induction

Lab: Electromagnetic Induction — Cumulative exam Answers

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22
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Which diagram best illustrates the magnetic field of a bar magnet?

A
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option A
B
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option B
C
A bar magnet with a north and south pole. Field line vectors are leaving the north pole and curl around to the south pole.
Option C
D
A bar magnet with a north and south pole. Field line vectors are leaving the south pole and curl around to the north pole.
Option D
23
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A ray diagram without the produced image is shown.

Question illustration
A
real and larger than the object
B
real and smaller than the object
C
inverted and larger than the object
D
upright and larger than the object
24

Which electromagnetic wave transfers the least amount of energy?

A
gamma
B
X-ray
C
ultraviolet
D
microwave
25

Aluminum has a frequency threshold of 9.846 × 1014 Hz. Which best explains what will happen when light with a frequency below the frequency threshold strikes aluminum?

A
Electrons will be ejected immediately.
B
No electrons will be ejected.
C
Electrons will start being ejected several seconds after the light strikes the aluminum.
D
No electrons will be ejected unless the intensity is very high.
26

A positive rod is touched to a neutral sphere.

Question illustration
A
It is showing the direction that protons move in, making the sphere negative.
B
It is showing the direction that protons move in, making the sphere positive.
C
It is showing the direction that electrons move in, making the sphere positive.
D
It is showing the direction that electrons move in, making the sphere negative.
27

Two identical waves are traveling toward each other in the same medium. One has a positive amplitude, meaning that its peaks only go upward, and the other wave has a negative amplitude, with peaks going downward.

A
constructive interference
B
destructive interference
C
a reflecting wave
D
wave refraction
28

What are the conditions needed for an ideal pendulum? Check all that apply.

A
Gravitational force acts to pull the pendulum’s mass down.
B
The mass of the rod of the pendulum is evenly distributed along the rod.
C
The pivot on which the pendulum swings is frictionless.
D
The pendulum swings through its equilibrium position as a result of inertia.
E
Tension acts downward on the pendulum’s mass.
29

The wave shown below is produced in a rope.Which shows the motion of the rope at Point P as the wave passes through it?

Question illustration
A
A dot with a vector drawn right and a vector drawn left.
Option A
B
A dot vector drawn up and vector drawn down.
Option B
C
A dot with a vector drawn up to the right and a vector drawn down to the left.
Option C
D
A dot with a vector drawn up to the left and a vector drawn down to the right.
Option D
31

On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. The children push off of one another, and the boy moves away with a velocity of +3 m/s.

A
–1.9 m/s
B
+1.9 m/s
C
–4.8 m/s
D
+4.8 m/s
32

A spring has a spring constant of 48 N/m. The end of the spring hangs 8 m above the ground.

A
96 N
B
288 N
C
384 N
D
480 N
33

A 6 cm object is 15 cm from a convex lens that has a focal length of 5 cm. What is the distance of the image from the lens, to the nearest hundredth?

A
–33.33 cm
B
–7.50 cm
C
7.50 cm
D
33.33 cm
34

What is the main difference between a permanent magnet and a temporary magnet?

A
A permanent magnet is made of a ferromagnetic material, while a temporary magnet is not.
B
A temporary magnet attracts only metal objects, while permanent magnets attract both metal objects and other magnets.
C
The domains in a temporary magnet easily lose alignment, but the domains in a permanent magnet keep their alignment.
D
There are domains in a permanent magnet, but not in a temporary magnet.
35

A wire is joined to points X and Y in the circuit diagram shown.How does the circuit change when the wire is added?

Question illustration
A
A closed circuit occurs and makes all bulbs turn off.
B
An open circuit occurs and makes all bulbs turn off.
C
A short circuit occurs and makes bulbs 3 and 4 turn off but keeps bulbs 1 and 2 lit.
D
A short circuit occurs and makes bulbs 1 and 2 turn off but keeps bulbs 3 and 4 lit.
36

What is the resistance in a circuit that carries a 0.75 A current when powered by a 1.5 V battery?

A
0.50 Ω
B
1.1 Ω
C
2.0 Ω
D
2.3 Ω
37

A current of 1.8 A delivers 2.5 C of charge.How much time was required?

A
0.70 s
B
0.72 s
C
1.4 s
D
4.5 s
38

Which changes in an electric motor will make the motor stronger? Select 3 options.using a stronger permanent magnetusing a weaker permanent magnetincreasing current in the electromagnetdecreasing current in the electromagnetincreasing the distance between the magnetsdecreasing the distance between the magnets

A
using a stronger permanent magnet
B
using a weaker permanent magnet
C
increasing current in the electromagnet
D
decreasing current in the electromagnet
E
increasing the distance between the magnets
F
decreasing the distance between the magnets
39

Which statements correctly describe the effect of distance in determining the gravitational force and the electrical force? Check all that apply.The gravitational force has an infinite reach.The electrical force has an infinite reach.The gravitational force is inversely proportional to the distance.The electrical force is inversely proportional to the distance.The gravitational force is inversely proportional to the square of the distance.The electrical force is inversely proportional to the square of the distance.

A
The gravitational force has an infinite reach.
B
The electrical force has an infinite reach.
C
The gravitational force is inversely proportional to the distance.
D
The electrical force is inversely proportional to the distance.
E
The gravitational force is inversely proportional to the square of the distance.
F
The electrical force is inversely proportional to the square of the distance.
40

The diagram shows the electric field lines around two charges.

Question illustration
A
They are negative, and they repel.
B
The left is negative and the right is positive, so they attract.
C
The left is positive and the right is negative, so they attract.
D
They are positive, and they repel.
41

A bell is rung. What best describes the density of air around the bell?

A
The air density does not change.
B
The air density increases and then returns to normal levels.
C
The air density decreases and then returns to normal levels.
D
The air density increases and decreases repeatedly before returning to normal.
42

A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T.

A
9.1 × 10–5 m/s
B
1.3 × 10–4 m/s
C
7.6 × 103 m/s
D
1.1 × 104 m/s

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