Question 1 Two plastic balls, each of radius 17.8 cm, are placed so that there is a 18.3 cm space between them. The charge on one ball is +5.80 nC and the charge on the other is -2.50 nC. What is the magnitude of the electric field at a point directly midway between the two balls? O 2.36x10# N/C O 408 N/C O 2.23x10# N/C O 1.03x10# N/C Question 2 A capacitor is formed by placing two circular disks, each of diameter 9.50 cm, a distance of 0.260 mm apart. The disks are charged so that the electric field inside the capacitor is 7.60x10" N/C. What is the charge on each disk? O 19.1 nc 0 9.54 nc O 1.36 nC O 4.77 nc Question 3 A-8.80 nC charge of mass 4.50x10" kg is released from rest 2.90 mm above a very large plane of positive charge. The charge accelerates toward the plane and collides with a speed of 3.20 m/s. What is the surface charge density of the plane? 4.99x106 C/m2 1.60x10'5 C/m2 7.99x10"6 C/m2 O 3.26*10" C/m2