Passage VII
Identical spheres, X and Y, had electrical charges Qx and QY, respectively. Throughout each of 13 trials, the spheres remained fastened to the horizontal floor of a vessel a distance d apart, with X due east of Y (see Figure 1).
The vessel was filled with a medium having a dielectric constant, K. (K reflects a medium's ability to modify the electrical force between charges.) X exerted an electrical force of magnitude FY on Y, and Y exerted an electrical force of magnitude Fx on X. Each force was directed either east or west.
Table 1 lists K for 4 media. Table 2 lists Qx, QY, d, the medium, Fx, and FY for each trial.
40. In Trial 9, the electrical force exerted by Sphere Y on Sphere X and the electrical force exerted by Sphere X on Sphere Y were exerted in which direction(s)?
Your Answer is
Correct Answer is G
Explanation
Look at trail 9 in table 2, both X and Y are positively charged, so X and Y repel each other, refer to figure 1, X moves to east, Y should move to west