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AP Physics C: E&M
9.3 Conservation of Electric Energy
9.1 Electric Potential Energy
IntermediateMCQMathematicalConceptual24.4k
An equilateral triangle with a horizontal base and an apex pointing vertically upward, drawn with thin dashed lines. The side length of each of the three dashed line segments is labeled with a centered letter \(d\). At each of the three vertices sits a small shaded gray circular disk representing a particle with charge \(+q\). The top apex vertex is labeled 1 with text positioned just above the disk. The bottom-left vertex is labeled 2 with text positioned just to the left of the disk. The bottom-right vertex is labeled 3 with text positioned just to the right of the disk. No other labels, lines, text, or axes appear.
Three identical charges at the vertices of an equilateral triangle.
Three identical small particles, each having mass \(m\) and positive charge \(q\), are initially held at rest at the vertices of an equilateral triangle of side length \(d\). In three separate scenarios, one or more particles are released from rest while any remaining particles are held fixed in place:

Case I: Only particle 1 is released, while particles 2 and 3 remain fixed.
Case II: Particles 1 and 2 are released simultaneously, while particle 3 remains fixed.
Case III: All three particles are released simultaneously.

Which of the following correctly ranks the final kinetic energy \(K_1\) of particle 1 after it has traveled infinitely far from the other particles?

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