13. Two identical spheres of mass 1.0 kg each carry a charge of 1.0 C. In comparing the electric and gravitational forces between the spheres, it can be concluded that: (K) usm ACADEMY SPH4U FINAL EXAM a. FE is greater than Fg b. F9 is greater than FE c. the two forces are equal d. the forces cannot be compared without knowing if the signs of the charges are the same or opposite . the forces cannot be compared without knowing the distance between the spheres {D 14. There is a potential difference between a pair of parallel plates, and plate A is positive and plate B is negative. A positive test charge is placed between the two plates. The plate with the higher electric potential is: (K) plate A plate B plates A and B have the same potential the plate that is closer to the positive charge it depends on the mass of the test charge 599.0575\" 15. Which of the following statements about eld lines is true? (K) a. Field lines are always perpendicular to the surface of the object creating the field. Field lines always point in the direction of the motion of the object creating the field. Field lines never cross. b c. d. Field lines are always straight. e Field lines represent a force that remains uniform along the entire length of the field line