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Suppose a positively charged object A is brought in contact with an uncharged object B in a closed system. What type of charge will be left on object B?
  1. negative
  2. positive
  3. neutral
  4. cannot be determined
Question by OpenStax is licensed under CC BY 4.0.
Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 18, Problem 4 (Test Prep for AP® Courses) (0:48)

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This is College Physics Answers with Shaun Dychko. A positively charged object A is brought in contact with an uncharged object B in a closed system, which means we don't have to worry about the charges moving in down to ground or anything like that. So before contact between A and B, as A is approaching B, there will be an induced charge distribution in B as the electrons are attracted to this side here— that's closer to this positively charged object A— and then during contact, we'll have an even distribution of the charge among both objects A and B and then after we are moving object A, object B will be left with positive charge so the answer is B.