If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = 80 nC, and q = 24 nC in the figure, what is the magnitude of the total electric force on q? Q O a. 2.7 N b. 1.9 N C. 2.3 N d. 1.5 N e. 0.52 N a 90 Q2 b A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = -3.0 m. If Q = 50 JC, what is the magnitude of the electrostatic force on a third point charge, -Q, placed on the y axis at y = +4.0 m? a. 2.5 N b. 3.0 N C. 3.7 N d. 4.4 N e. 1.8 N If a = 60 cm, b = 80 cm, Q = -4.0 nC, and q = 1.5 nC, what is the magnitude of the electric field at point P? b Q P a. 68 N/C b. 72 N/C C. 77 N/C d. 82 N/C e. 120 N/C a a b If a = 60 cm, b = 80 cm, Q = -6.0 nC, and q = 4.0 nC, what is the magnitude of the electric field at point P? a. 35 N/C b. 42 N/C c. 52 N/C Q O d. 64 N/C e. 104 N/C a 90 q P b A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners? a. 20 N/C b. 14 N/C C. 4.0 N/C d. 12 N/C e. 8.0 N/C A 40-JC charge is positioned on the x axis at x = 4.0 cm. Where should a -60-HC charge be placed to produce a net electric field of zero at the origin? a. -5.3 cm b. 5.7 cm C. 4.9 cm d. -6.0 cm e. +6.0 cmIf Q = 25 HO, q = 10 p0, and L = 40 cm in the gure, what is the magnitude of the electrostatic force on q? q a. 28 N b. 22 N O c. 20 N d. 14 N L ,' x L e. 10N ,z'xoov o ---------- 0 +0 0 A charge of 50-pC is placed on the yaxis at y = 3.0 cm and a 77-pC charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin? a. 1.2 x 102'0 m/s2 b. 1.5 x 1020 m/s2 c. 1.0 x 1020 m/s2 d. 1.8 x 1020 m/s2 0. 2.0 x 1020 m/s2 A +20-nC point charge is placed on the x axis at x = 2.0 m, and a -25-nC point charge is placed on the y axis at y = -3.0 m. What is the direction of the electric field at the origin? a. 209 b. 61 c. 29 d. 241 9. 151 Each of two small non-conducting spheres is charged positively, the combined charge being 40 p0. When the two spheres are 50 cm apart. each sphere is repelled from the other by a force of magnitude 2.0 N. Determine the magnitude of the smaller of the two charges. a. 1.4 pC b. 1.1 pC c. 2.0 pC d. 3.3 pC e. 17 p0 if Q = 15 n0, a = 3.0 m, and b = 4.0 m, what is the magnitude of the electric eld at point P? a. 33 N/C b. 31 MC c. 24 N16 Q Q ---------- . p d. 19 N/C e. 13 N/C : | I l | |