Electrostatic Force Quiz

Which diagram best represents the directions of the gravitational force, F_g, and the electrostatic force, F_e, acting on sphere A due to the mass and charge of sphere B? [Vectors are not drawn to scale.]

• F_e pointing towards B and F_g pointing away from B.

• F_e pointing away from B and F_g pointing towards A.

• F_e pointing towards B and F_g pointing towards A.

• F_g pointing towards B and F_e pointing away from A.

What is the magnitude of the electrostatic force between two electrons separated by a distance of 1.00 x 10^-8 meter?

• 2.56 x 10^-22 N

• 2.30 x 10^-20 N

• 2.30 x 10^-12 N

• 1.44 x 10^-1 N

Two metal spheres, A and B, possess charges of 1.0 microcoulomb and 2.0 microcoulombs, respectively. In the diagram below, arrow F represents the electrostatic force exerted on sphere B by sphere A. Which arrow represents the magnitude and direction of the electrostatic force exerted on sphere A by sphere B?

• Arrow F pointing towards sphere A.

• Arrow 2F pointing towards sphere A.

• Arrow F pointing away from sphere A.

• Arrow 2F pointing away from sphere A.

What is the magnitude of the electrostatic force exerted by sphere A on sphere B?

• 7.2 x 10^-3 N

• 3.6 x 10^-3 N

• 8.0 x 10^-13 N

• 4.0 x 10^-13 N

If the two spheres were touched together and then separated, the charge on sphere A would be

• -3.0 x 10^-7 C

• -6.0 x 10^-7 C

• -1.3 x 10^-6 C

• -2.6 x 10^-6 C

Two electrons are separated by a distance of 3.00 x 10^4 meters. What are the magnitude and direction of the electrostatic forces each exerts on the other?

When two point charges of magnitude q1 and q2 are separated by a distance r, the magnitude of the electrostatic force between them is F. What would be the magnitude of the electrostatic force between point charges 2q1 and 4q2, when separated by a distance of 2r?

• F

• 2F

• 16F

• 4F

When two point charges are a distance d apart, the magnitude of the electrostatic force between them is F. If the distance between the point charges is increased to 3d, the magnitude of the electrostatic force between the two charges will be

• F/9

• F/3

• 2F

• 4F

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

• F/4

• 2F

• F/2

• 4F

In the diagram, 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?

• F/4

• 2F

• F/2

• 4F