AnswersTX-Physics CRLab: Circuit Design

Magnets and Magnetism Answers

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1
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A wire delivers 12.0 C of charge in 4.0 s.What is the current in the wire?

A
3.0 A
B
8.0 A
C
16 A
D
48 A
2
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Charges of +2 µC and +3 µC are 4 mm from each other. Raina’s group draws four diagrams trying to represent the electrical force between the charges.Which diagram is correct?

Question illustration
A
W
B
X
C
Y
D
Z
3

Maria makes a graphic organizer to compare open, closed, and short circuits. She adds the labels shown.Label 1: Current flows in the circuit.Label 2: This forms when a bulb burns out.

Question illustration
A
Label 1: ZLabel 2: X
B
Label 1: YLabel 2: W
C
Label 1: XLabel 2: Y
D
Label 1: YLabel 2: Z
4

Which best describes the materials that make up an electrical cord?

A
a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons
B
a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons
C
a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons
D
a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons
5

A positive rod is placed to the left of sphere A, and the spheres are separated.

Question illustration
A
Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.
B
Sphere A is negative and sphere B is positive because electrons from sphere B are attracted to the rod and move to sphere A.
C
Sphere A is positive and sphere B is negative because electrons from the rod move to sphere B and protons then move to sphere A.
D
Sphere A is positive and sphere B is negative because protons move from sphere B to the rod and also to sphere A.
6

Which statements correctly compare the gravitational force with the electrical force? Check all that apply.The gravitational force can be repulsive.The gravitational force can be attractive.The electrical force can be repulsive.The electrical force can be attractive.Any two objects experience a gravitational force between them.Any two objects experience an electrical force between them.

A
The gravitational force can be repulsive.
B
The gravitational force can be attractive.
C
The electrical force can be repulsive.
D
The electrical force can be attractive.
E
Any two objects experience a gravitational force between them.
F
Any two objects experience an electrical force between them.
7

The chart shows the power ratings of 3 clothes dryers and the time needed to dry a load of 10 towels. What is the difference in energy used between the dryer that uses the greatest amount of energy and the dryer that uses the least amount?

Question illustration
A
0.18 kWh
B
0.20 kWh
C
1.62 kWh
D
1.82 kWh
8

How does a rubber rod become negatively charged through friction?

A
It touches a negatively charged object, and protons move off of the rod.
B
It touches a positively charged object, and electrons move onto the rod.
C
It is rubbed with another object, and electrons move onto the rod.
D
It is rubbed with another object, and protons move off of the rod.
9

What is the continuous flow of electric charge?

A
voltage
B
resistance
C
potential difference
D
current
10

A circuit has a current of 3.6 A and a resistance of 5.0 Ω.What is the voltage applied to the circuit?

A
0.72 V
B
1.4 V
C
8.6 V
D
18 V
11

What is the equation for calculating the electrical force, Fe, between two charges?

A
Fe = k
Option A
B
Fe =
Option B
C
Fe = k
Option C
D
Fe = k
Option D
12

What is the unit for electrical power?

A
volt (V)
B
joule (J)
C
kilowatt-hour (kWh)
D
watt (W)
13

The current in the circuit shown is 2.0 A.

Question illustration
A
10 Ω
B
15 Ω
C
20 Ω
D
55 Ω
14

Jason makes a graphic organizer for insulators and conductors and wants to add the following labels to it.Label 1: Lacks free electronsLabel 2: AluminumIn which regions should Jason place each label?

Question illustration
A
Label 1: XLabel 2: Y
B
Label 1: ZLabel 2: X
C
Label 1: XLabel 2: Z
D
Label 1: ZLabel 2: Z
15

Which changes would cause an increase in the resistance of a wire? Check all that apply.increasing its temperaturedecreasing its temperatureusing a longer wireusing a shorter wireusing a thicker wireusing a thinner wire

A
increasing its temperature
B
decreasing its temperature
C
using a longer wire
D
using a shorter wire
E
using a thicker wire
F
using a thinner wire
16

Kiki makes a table to compare the particles in a magnesium atom to those in a magnesium ion.She knows that a magnesium ion has an electric field that points away from the ion. What values should she use to complete her table?

Question illustration
A
X: 14Y: 12Z: 12
B
X: 12Y: 12Z: 10
C
X: 12Y: 10Z: 12
D
X: 12Y: 12Z: 14
17

Bruce collects the data on four electric circuits listed in the table. Bruce must report any circuits that deliver more than 4.0 C of charge in 8.0 s.Which lists every circuit that Bruce must include in his report?

Question illustration
A
X and Z
B
X and Y
C
W and Y
D
W and Z
18

What is a path through which electric charges travel?

A
electric circuit
B
resistance
C
voltage
D
electric current
19

A source charge generates an electric field of 4286 N/C at a distance of 2.5 m. What is the magnitude of the source charge? (Use k=)

A
1.2 µC
B
1.2 µC
C
3.0 µC
D
3.0 µC
E
1.2 C
F
1.2 C
G
3.0 C
H
3.0 C
20

Jason sees a news report about a traffic jam caused by a truckload of tires that spilled across the road. The next day in class, he uses the traffic jam as an analogy to explain electric circuits to his friend.Which is most likely the analogy that Jason used?

A
The cars represent moving charges, and the spilled tires represent an increased voltage that causes the current to decrease.
B
The cars represent moving charges, and the spilled tires represent an increased resistance that causes the current to decrease.
C
The tires represent moving charges, and the cars represent an increased resistance that causes the current to decrease.
D
The tires represent moving charges, and the cars represent an increased voltage that causes the current to decrease.

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