4. [-0.06I2 Points] PREVIOUS ANSWERS OSUNIPHYS1 22.3.WA.025. MY NOTES | ASK YOUR TEACH ER PRACTICE ANOTHER Two small copper spheres, identical in size, have charges q, = 21.0 pc and q2 = +47.o uc, and are located in the x-y plane at (o, 4.25) cm and (2.30, 0) cm respectively. (Express your answer in vector form. Do not enter units in your expression. Assume the spheres may be approximated as point charges.) (a) Find the force ql exerts on qz. F: x Review the vector form of Coulomb's law. It might be helpful to draw a sketch and label all charges, distances, and relevant angle(s). N (b) The two copper spheres are briefly brought into contact and then moved back to their original locations. Now what force does 171 exert on 72? = N Additional Malarlall Li Reading Submil Answer 5. [I3 Points] OSUNIPHYS1 22.4.Wk035. MY NOTES | ASK YOUR TEACH ER PRACTICE ANOTHER Three charged marbles are glued to a nonconducting surface and are placed in the diagram as shown. The charges or each marble are q1 = 590 pt, q2 = 1.20 pc, and q3 = 2.so pc. Marble a1 is a distance r1 = 3.00 cm to the left of the marble L72. while marble q3 is a distance r3 = 2.00 cm to the right of the marble o2, as shown. rl. '72 '13 \\72:0m observation pain! Calculate the magnitude of the electric eld a distance r' = 1.00 cm to the left of the center marble. N/C Another marble is placed 1 cm to the left of the middle marble. If this new marble has a charge of 73.70 uC, calculate the magnitude and direction of the force on it. magnitude N