15. The diagram below shows two metal spheres suspended by strings and separated by a distance of 3.0 meters. The charge on sphere A is +5.0 x 10 coulomb, and the charge on sphere B is +3.0 x 10 $ coulomb. 16. If the charge is doubled on each of two small spheres having a fixed distance between their centers, the magnitude of the electrostatic force that one sphere exerts on the other will be (1) halved (2) doubled (3) quartered (4) quadrupled -3.0 m- 17. A point charge A of +3.0 x 10 7 coulomb is placed 2.0 x 10 2 meter from a second point charge B of +4.0 x 10 coulomb. Calculate the magnitude of the electrostatic force that charge A exerts on charge B. B) What forces does sphere A exert on sphere B? (1) an attractive gravitational force and a repulsive electrostatic force of 15 N (2) an attractive gravitational force and a repulsive electrostatic force of 45 N (3) a repulsive gravitational force and an attractive electrostatic force of 15 N (4) a repulsive gravitational force and an attractive electrostatic force of 45 N

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