Two Balloons Repelling Each Other: To show that like charges repel.

Here are the answers to the True/False statements:

• Observation: The comb picks up paper pieces.

  • When a plastic comb is rubbed, it becomes electrically charged. When brought near small paper pieces, it induces an opposite charge on the side of the paper closest to the comb, leading to an attractive force that picks up the paper.
  • Answer: $\boxed{\text{TRUE}}$

• Explanation: The comb becomes charged and induces opposite charges in the paper, leading to attraction.

  • This statement correctly describes the process of charging by friction and electrostatic induction, which results in the attraction between the charged comb and the neutral paper pieces.
  • Answer: $\boxed{\text{TRUE}}$

• Observation: The balloons repel each other.

  • When both balloons are rubbed with the same material (wool or hair), they acquire the same type of electrical charge. Objects with like charges repel each other.
  • Answer: $\boxed{\text{TRUE}}$

• Explanation: Both balloons have the same type of charge (usually negative), so they repel.

  • This explanation is accurate. Rubbing both balloons with wool or hair causes them to gain electrons, making them both negatively charged. Since they both carry the same charge, they will exert a repulsive force on each other.
  • Answer: $\boxed{\text{TRUE}}$