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Item RG116002: The electrostatic potential energy of the system of two positively charged objects decreases as the distance between then increases, and the kinetic energy of the moving particle increases and the distance increases..

A positively charged particle is held close to a stationary positively charged object in a vacuum chamber in which all the air has been removed.

When the particle is released, it moves away from the stationary object.

How do the electrostatic potential energy of the particle-object system and the kinetic energy of the small particle change as the particle moves away from the stationary object (before it hits the wall of the vacuum chamber)?

  1. The electrostatic potential energy of the system increases, and the kinetic energy of the particle decreases.
  2. The electrostatic potential energy of the system decreases, and the kinetic energy of the particle increases.
  3. The electrostatic potential energy of the system and the kinetic energy of the particle both increase.
  4. The electrostatic potential energy of the system stays the same, and the kinetic energy of the particle increases.
Distribution of Responses
Chart showing distrubtion of responses for Item EG116002
Scale Score for Item Difficulty
(200[Easy]-800[Difficult])
509
Students Responding Correctly
Group Correct Total Percent
Overall 428 1124 38%
Grades
  4–5N/AN/AN/A
  6–8 229 666 34%
  9–12 199 458 43%
Gender
  Male20854638%
  Female20756037%
Primary Language
  English37398838%
  Other3811035%

View data table