Introduction to Electrostatic Force

Which graph best represents the relationship between the magnitude of the electrostatic force and the distance between two oppositely charged particles?

• 
• 
• 
• 

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NGSS.HS-PS2-4

If the charge on each of two small charged metal spheres is doubled and the distance between the spheres remains fixed, the magnitude of the electric force between the spheres will be

• two times as great

• four times as great

• one-half as great

• the same

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NGSS.HS-PS3-5

In the diagram above, a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.2 meter from the test charge. Sphere B has a charge of -2q and is located 0.1 meter from the test charge. If the magnitude of the force on the test charge due to sphere A is F, what is the magnitude of the force on the test charge due to

sphere B?

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NGSS.HS-PS3-5

The magnitude of the electrostatic force between two point charges is F. If the distance between the charges is doubled, the electrostatic force between the charges will become

• 4F

• 2F

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NGSS.HS-PS2-4

Two positively charged masses are separated by a distance, r. Which statement best describes the gravitational and electrostatic forces between the two masses?

• The gravitational force is attractive and the electrostatic force is

  repulsive.

• The gravitational force is repulsive and the electrostatic force is

  attractive.

• Both forces are attractive.

• Both forces are repulsive.

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NGSS.HS-PS2-4

Two protons are located one meter apart. Compared to the

gravitational force of attraction between the two protons, the electrostatic force between the protons is

• weaker and attractive

• stronger and attractive

• stronger and repulsive

• weaker and repulsive

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NGSS.HS-PS2-4

What is the approximate electrostatic force between two protons separated by a distance of 1.0 x 10^-6 meter?

• 9.0 x 10²¹ N and attractive

• 9.0 x 10²¹ N and repulsive

• 2.3 x 10^-16 N and attractive

• 2.3 x 10^-16 N and repulsive

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NGSS.HS-PS2-4

Electrostatic force F exists between two point charges. If the

distance between the charges is tripled, the force between the charges will be

• 9F

• 3F

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NGSS.HS-PS2-4

The diagram above shows two negatively charged balloons

suspended from nonconducting strings being held by a student. What occurs as the student brings the balloons closer to each other without allowing them to touch?

• The magnitude of the electrostatic force between the balloons increases, and they attract each other.

• The magnitude of the electrostatic force between the balloons decreases, and they repel each other.

• The magnitude of the electrostatic force between the balloons increases, and they repel each other.

• The magnitude of the electrostatic force between the balloons decreases, and they attract each other.

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The diagram above shows two metal spheres charged to +1.0 x 10^-6 coulomb and +3.0 x 10^-6 coulomb, respectively, on insulating stands separated by a distance of 0.10 meter.

The spheres are touched together and then returned to their original positions. As a result, the magnitude of the electrostatic force between the spheres changes from 2.7 N to

• 1.4 N

• 14 N

• 3.6 N

• 1.8 N

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NGSS.HS-PS2-4