Answers26-27 IC Physics 7614BWave Properties

Coulomb's Law Answers

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Rolanda sees an error in her friend’s graphic organizer comparing electrical and gravitational forces.

Question illustration
A
The note about mass belongs in region Z, and the note about charge belongs in region X.
B
The note about mass belongs in region Y, and the note about infinite reach belongs in region Z.
C
The note about charge belongs in region Y.
D
The note about infinite reach belongs in region Y.
2
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How does the electrical force relate to the charge of an object?

A
It is inversely proportional to the square of the charge.
B
It is directly proportional to the square of the charge.
C
It is inversely proportional to the charge.
D
It is directly proportional to the charge.
3

One charge is decreased to one-third of its original value, and a second charge is decreased to one-half of its original value.

A
It will increase to six times the original force.
B
It will increase to thirty-six times the original force.
C
It will decrease to one-sixth the original force.
D
It will decrease to one-thirty-sixth the original force.
5

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
6

Both the electrical force and the gravitational force between two objects share which relationship?

A
They are directly proportional to mass.
B
They are inversely proportional to the square of the distance.
C
They are inversely proportional to charge.
D
They are directly proportional to the square of the distance.
7

Which statements correctly compare the gravitational force with the electrical force? Check all that apply.

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.
8

The table shows the charges and the distance between five different pairs of objects.If the force between two charges, q, separated by a distance, d, is F, what is the list of the other forces, from greatest to least?

Question illustration
A
Y, Z, W, X
B
Y, W, X, Z
C
Z, Y, W, X
D
Z, X, W, Y
9

The table lists the values of the electrical force and the gravitational force between two protons.

Question illustration
A
The electrical force is 1.2 × 1036 times less than the gravitational force.
B
The electrical force is 1.2 × 1036 times greater than the gravitational force.
C
The electrical force is 8.0 × 10–37 times less than the gravitational force.
D
The electrical force is 8.0 × 10–37 times greater than the gravitational force.
10

A positive charge, q1, of 5 µC is 3 × 10–2 m west of a positive charge, q2, of 2 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2?

A
magnitude: 3 Ndirection: east
B
magnitude: 3 Ndirection: west
C
magnitude: 100 Ndirection: east
D
magnitude: 100 Ndirection: west

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