Passage V
Students studied electric forces between charged spheres using the apparatus shown in Figure 1.
In each trial, the students mounted 2 uncharged conducting spheres D cm apart on the stands. Then they placed a negative charge on each sphere. The electric force between the spheres caused Stand 2's sphere to move away from Stand 1's sphere, thereby twisting the vertical wire clockwise (see Figure 2).
The students twisted the wire counterclockwise until Stand 2's sphere had moved back to its original position. The angle through which they twisted the wire,
29. During a given trial, while the 2 charged spheres moved apart, the potential energy stored in the vertical steel wire most likely:
Your Answer is
Correct Answer is A
Explanation
The farther the distance is, the larger θ is, and the more twisted the wire is. The root cause of the twisted wire is that the electrostatic force does work on it. So the more twisted, the more energy is stored