Two uncharged metal spheres, L and M, are in contact. A negatively charged rod i
ID: 1280907 • Letter: T
Question
Two uncharged metal spheres, L and M, are in contact. A negatively charged rod is brought close to L, but not touching it, as shown. The two spheres are slightly separated and the rod is then withdrawn. As a result: both spheres are neutral both spheres are positive both spheres are negative L is negative and M is positive L is positive and M is negative Two small charged objects attract each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value an e between them is reduced to d/2 the force becomes: F/16 F/8 F/4 F/2 F Charge is placed on the surface of a 2.7-cm radius isolated conducting sphere. The surface charge density is uniform and has the value 6.9 10 - 6 C/m2. The total charge on the sphere is: 5.6 10 - 10 C 2.1 10 - 8 4.7 10 - 8 C 6.3 10 - 8 C 9.5 10 - 3 C A capacitor C "has a charge Q". The actual charges on its plates are: Q, Q Q/2, Q/2 Q, - Q Q/2, - Q/2 Q, 0Explanation / Answer
6. A. both are neutral
7. C ( as F = kq1q2/r^2 , Fnew = K q1q2/16)/d^2/4 = F/4
8. D. ( 6.3*10^-8 C) as L = q/A -> charge q = L * 4pir^2
9. C, Q and - Q
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