QUESTION 1 Three point charges are located at the corners of an equilateral triangle as in Figure P15.13. Find the magnitude and direction of the net electric force on the 2.00 JC charge. 7.00 UC 0.500 m 60.09 2.00 AC -4.00 JC FIGURE P15.13 (Problems 13 and 24) QUESTION 2 Suppose three point charges are arranged in a coordinate system. The charge q 1 = +1.4 pC is located at the origin; the second charge q 2 = -0.5 JC is located at (0.7 m, 1.5 m) and the third charge q 3 = +3.3 pC is located at (1.3 m, 0). Calculate (a) the force on q 1 due to the other two charges 0.5m 1.4m P Q 1.0m (b) the force on q 2 due to the other two charges (c) the force on q 3 due to the other two charges QUESTION 3 Two small metallic spheres, each of mass 0.20 g, are suspended as pendulums by light strings from a common point as shown in Figure P15.15. The spheres are given the same electric charge, and it is found that they come to equilibrium when each string is at an angle of 5.0" with the vertical. If each string is 30.0 cm long, what is the magnitude of the charge on each sphere? 30.0 cm 0.20 g 0.20 g FIGURE P15.15 QUESTION 4 In Figure P15.27 determine the point (other than infinity) at which the total electric field is zero