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Electrostatics — Quiz Answers

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Tracy scuffs her socked feet across a carpet. When she touches a doorknob, she gets a small shock. How did Tracy become charged?

A
through conduction between her feet and the carpet
B
through friction between her feet and the carpet
C
through conduction between her hand and the doorknob
D
through friction between her hand and the doorknob
2
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How does a rubber rod become negatively charged through friction?

A
It is rubbed with another object, and protons move off of the rod.
B
It touches a positively charged object, and electrons move onto the rod.
C
It touches a negatively charged object, and protons move off of the rod.
D
It is rubbed with another object, and electrons move onto the rod.
3

What is the electric potential energy of a charge that experiences a force of 3 point 6 times 10 to the negative 4 power cap n when it is 9 point 8 times 10 to the negative 5 power m from the source of the electric field?

A
2 point 7 times 10 inverse cap j
B
3 point 7 times 10 to the 0 power cap j
C
3 point 5 times 10 to the negative 8 power cap j
D
4 point 6 times 10 to the negative 4 power cap j
5

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

A
a metallic insulator lacking free electrons surrounded by a rubber conductor with free electrons
B
a metallic conductor with free electrons surrounded by a rubber insulator lacking free electrons
C
a metallic conductor lacking free electrons surrounded by a rubber insulator with free electrons
D
a metallic insulator with free electrons surrounded by a rubber conductor lacking free electrons
6

Which statements best characterize conductors? Choose two correct answers.

A
Glass is an example of a conductor.
B
Conductors do not allow electricity to easily move through them.
C
Metal is an example of a conductor.
D
Conductors allow electricity to easily move through them.
E
Conductors restrict the flow of thermal energy.
7

How does charging by conduction occur?

A
A neutral object touches another neutral object.
B
A charged object touches a neutral object.
C
A charged object is brought near a neutral object without touching it.
D
A neutral object is brought near another neutral object without touching it.
8

What is the value of the charge that experiences a force of 2 point 4 times 10 to the negative 3 power cap n in an electric field of 6 point 8 times 10 to the negative 5 power cap n over cap c ?

A
2 point 5 times 10 to the negative 3 power cap c
B
2 point 8 times 10 to the negative 3 power cap c
C
3 point 5 times 10 to the 1th power cap c
D
1 point 6 times 10 to the negative 7 power cap c

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