Introduction to Electrostatic Force

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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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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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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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

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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An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce no change in the electrostatic force between the spheres?

• doubling q on both spheres while halving r

• doubling q on one sphere while halving r

• doubling q on both spheres while doubling r

• doubling q on one sphere while doubling r

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What is electricity

• energy produced by the movement of electrons

• energy produced by the movement of protons

• energy produced by the movement of neutrons

• Electricity is not a form of energy

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Why do socks stick together when they come out of the dryer?

• One has a negative charge and the other has a positive charge

• Both have negative charges

• Both have positive charges

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Protons have a ________ charge.

• Positive

• Negative

• No charge

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Electrons have a _________ charge.

• Negative

• Postive

• No Charge