Questions 25-30 with little work if needed

25) 5216 -2 - Page 5 In the diagram below, two positively charged spheres, A and B, of masses my and my are located a distance d apart. Which diagram best represents the directions of the gravitational force, Fo, and the electrostatic force, F, acting on sphere A due to the mass and charge of sphere B? [Vectors are not drawn to scale.] Fe A) C ) Fg A Fe B D) Fe Fg 26) 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 A) weaker and repulsive C) stronger and repulsive B) weaker and attractive D) stronger and attractive 27) The diagram below shows two metal spheres charged to +1.0 x 104 coulomb and +3.0 x 10-6 coulomb, respectively, on insulating stands separated by a distance of 0.10 meter. +1.0 x 10-6 C +3.0 x 10-6 C 0.10 m- 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 A) 14 N B) 1.8 N C) 1.4 N D) 3.6 N 28) What is the net charge of an object possessing an excess of 6.0 x 10 electrons? A) 9.6x 10-13 C B) 5.5 x 10-24 C C) 2.7 x 10-26 C D) 3.8 x 10-13 C 29) 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 A) one-half as great B) four times as great C) two times as great D) the same 30) 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 2 B) 2F C) 4F D) A