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.
3

Mark creates a graphic organizer to review his notes about electrical force.

Question illustration
A
X: Decreasing to half will quadruple forceY: Doubling will double force
B
X: Doubling will cut force in halfY: Decreasing to half will cut force in half
C
X: Doubling will double forceY: Decreasing to half will quadruple force
D
X: Decreasing to half will double forceY: Doubling will cut force in half
5

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
6

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.
7

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.
8

Which factors affect the electrical force between two objects?

A
mass and distance between them
B
charge and distance between them
C
mass and electric field strength
D
charge and mass
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 negative charge, q1, of 6 µC is 0.002 m north of a positive charge, q2, of 3 µC. What is the magnitude and direction of the electrical force, Fe, applied by q1 on q2?

A
magnitude: 8 × 101 Ndirection: south
B
magnitude: 8 × 101 Ndirection: north
C
magnitude: 4 × 104 Ndirection: south
D
magnitude: 4 × 104 Ndirection: north

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