Test Review FQ3eso_U5_3_Electric force

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1 Test Review FQ3eso_U5_3_Electric force Identify the letter of the choice that best completes the statement or answers the question. 1.- 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? 2.- Two similar metal spheres, A and B, have charges of coulomb and coulomb, respectively, as shown in the diagram below. The magnitude of the electrostatic force on A due to B is 2.4 newtons. What is the magnitude of the electrostatic force on B due to A? a) 1.2 N c) 4.8 N b) 2.4 N d) 9.6 N 3.- Which graph best represents the relationship between the magnitude of the electrostatic force and the distance between two oppositely charged particles?

2 4.- An electrostatic force exists between two coulomb point charges separated by a distance of meter. As the distance between the two point charges is decreased, the electrostatic force of a) attraction between the two charges decreases b) attraction between the two charges increases c) repulsion between the two charges decreases d) repulsion between the two charges increases 5.- Gravitational forces differ from electrostatic forces in that gravitational forces are a) attractive, only c) neither attractive nor repulsive b) repulsive, only d) both attractive and repulsive 6.- Two protons (positive charges) are located one meter apart. Compared to the gravitational force of attraction between the two protons, the electrostatic force between the protons is a) stronger and repulsive c) stronger and attractive b) weaker and repulsive d) weaker and attractive 7.- In the diagram below, two positively charged spheres, A and B, of masses m A and m B are located a distance d apart. 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.]

3 8.- The diagram below shows two identical metal spheres, A and B, separated by distance d. Each sphere has mass m and possesses charge q. Which diagram best represents the electrostatic force F e and the gravitational force F g acting on sphere B due to sphere A? [Vectors are not drawn to scale.] 9.- The diagram below represents two charged, identical metal spheres What is the magnitude of the electric force between the two spheres? a) N c) N b) N d) N 10.- The diagram represents two small, charged, identical metal spheres, A and B that are separated by a distance of 2.0 meters.

4 What is the magnitude of the electrostatic force exerted by sphere A on sphere B? a) N c) N b) N d) N 11.- What is the magnitude of the electrostatic force exerted on an electron by another electron when they are 0.10 meter apart? (Charge of an electron coulombs ) a) N c) N b) N d) N 12.- Two electrons are separated by a distance of meter. What are the magnitude and direction of the electrostatic forces each exerts on the other? a) N away from each other b) N toward each other c) N away from each other d) N toward each other 13.- 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 a) F/4 c) F/2 c) 2F d) 4F 14.- 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 a) F/9 c) 2F c) F/3 d) 4F 15.- An electrical force of newton exists between two point charges, q 1 and q 2. If the distance between the charges is doubled, the new electrical force between the charges will be a) N c) N c) N d) N 16.- A distance of 1.0 meter separates the centers of two small charged spheres. The spheres exert gravitational force F g and electrostatic force F e on each other. If the distance between the spheres centers is increased to 3.0 meters, the gravitational force and electrostatic force, respectively, may be represented as a) F g /9 and F e /9 c) 3F g and 3F e c) F g /3 and F e /3 d) 9F g and 9F e

5 17.- The distance between an electron (negative charge) and a proton (positive charge) is varied. Which pair of graphs best represents the relationship between gravitational force, F g, and distance, r, and the relationship between electrostatic force, F e, and distance, r, for these particles? 18.- When two point charges of magnitude q 1 and q 2 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 2q 1 and 4q 2 when separated by a distance of 2r? a) F c) 16F b) 2F d) 4F

6 Test Review FQ3eso_U5_3_Electric force Answers

7 Test Review FQ3eso_U5_3_Electric force Key part 1. a. 11. c. 2. b. 12. a. 3. d. 13. a. 4. d. 14. a. 5. a. 15. c. 6. a. 16. a. 7. c. 17. a. 8. b. 18. b. 9. c. 10. b.