Two particles whose charges have equal magnitudes q but opposite signs are placed as shown. The reference point for zero potential is infinity. 
At which labeled point is the potential largest?
A. A
B. B
C. C
D. D
E. E
F. None of the labeled points
D. D
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Relative Velocity: The driver of a motorboat that can move at 10 m/s in still water wishes to travel directly across a river in which the current flows at 5.0 m/s.(a) At what angle, measured from the upstream direction, should the driver head the boat?(b) How many minutes will it take to cross the river if it is 1.6 km wide at that point?
Fill in the blank(s) with the appropriate word(s).
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
A) -36 mJ B) +18 mJ C) 0 mJ D) +36 mJ E) -18 mJ
Science is a body of knowledge that
A) describes order in nature. B) is an ongoing human activity. C) condenses knowledge into testable laws. D) all of the above E) none of the above
For which value of ? is the height of a projectile fired from ground level a maximum?
A) 30° above the horizontal B) 45° above the horizontal C) 55° above the horizontal D) 60° above the horizontal E) 90° above the horizontal