Coulomb's Law Answers

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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?

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A
W
B
X
C
Y
D
Z
2
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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
3

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.
4

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.
5

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
6

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
7

Three charges are located at the vertices of a triangle, as shown.

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W
B
X
C
Y
D
Z
8

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.
9

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.
10

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.

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