9. Two charges, +Q and -9, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point? EC. + Q -Q a. Vector EA C . Vector Ec b. Vector EB d. The electric field at that point is zero. 10. Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result? a. One object is positively charged and the other is negatively charge. b. One object is positively charged and the other is uncharged. C . One object is negatively charged and the other is uncharged. d. All of the above could result in such attraction. 1 1. When a glass rod is rubbed with silk, which of the following statements best describes what happens? a. Electrons are removed from the rod. C . The silk is charged positively. b. Protons are removed from the silk. d. The silk remains neutral. 12. If body M, with a positive charge, is used to charge body N by induction, what will be the nature of the charge left on the latter? a. must be equal in magnitude to that on M b. must be negative C . must be positive d. must be greater in magnitude than that on M 13. The electric field at the surface of a positively charged conductor has a direction characterized by which the following? a. tangent to the surface b. perpendicular inward toward the charge c. at a 450 angle to the surface d. perpendicular outward and away from the charge N