Answers26-27 LISD TX-Physics B-CR rev. 525Unit Test

Coulomb's Law Answers

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Moira is drawing the electric field lines around a pair of charges. One charge is positive, and the other charge is negative.

Question illustration
A
away from each charge and meeting in the middle
B
away from each charge and curving away from one another
C
away from the positive charge and toward the negative charge
D
away from the negative charge and toward the positive charge
2
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What is the value of the charge that experiences a force of 2.4 × 10–3 N in an electric field of 6.8 × 10–5 N/C?

A
1.6 × 10–7 C
B
2.5 × 10–3 C
C
2.8 × 10–3 C
D
3.5 × 101 C
3

A charge of 6.4 × 10–7 C experiences an electric force of 1.8 × 10–1 N. What is the electric field strength?

A
1.1 × 10–7 N/C
B
3.6 × 10–6 N/C
C
8.2 × 100 N/C
D
2.8 × 105 N/C
5

A charge of 8.5 × 10–6 C is in an electric field that has a strength of 3.2 × 105 N/C. What is the electric force acting on the charge?

A
0.27 N
B
2.7 N
C
27 N
D
270 N
6

What is the electric potential energy of a charge that experiences a force of 3.6 × 10–4 N when it is 9.8 × 10–5 m from the source of the electric field?

A
3.5 × 10–8 J
B
4.6 × 10–4 J
C
2.7 × 10–1 J
D
3.7 × 100 J
7

Through which element would someone most likely receive a shock?

A
iodine (I)
B
sulfur (S)
C
phosphorus (P)
D
chromium (Cr)
8

Which pair does NOT have an electric force between them?

A
a positive object and negative object
B
two positive objects
C
two neutral objects
D
two negative objects
9

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.
10

Which statements best characterize conductors? Check all that apply.Conductors allow electricity to easily move through them.Glass is an example of a conductor.Metal is an example of a conductor.Conductors do not allow electricity to easily move through them.Conductors restrict the flow of thermal energy.

A
Conductors allow electricity to easily move through them.
B
Glass is an example of a conductor.
C
Metal is an example of a conductor.
D
Conductors do not allow electricity to easily move through them.
E
Conductors restrict the flow of thermal energy.
11

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.
12

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
13

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
14

The area around a charged object that can exert a force on other charged objects is a(n) _________.

A
electric field
B
field line
C
conductor
D
electric potential energy
15

How do the charges compare when two objects are charged through friction?

A
The objects become oppositely charged and have equal amounts of charge.
B
The objects become positively charged and have equal amounts of charge.
C
The objects become negatively charged and have different amounts of charge.
D
The objects become oppositely charged and have different amounts of charge.

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