Multiple choice

Which example describes charging done by friction?

  1. touching a Van de Graaff generator

  2. storm clouds charging the ground

  3. rubbing a balloon on your hair

  4. opening up a book

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Friction involves rubbing two materials together, which transfers electrons from one to the other. Rubbing a balloon on hair is a classic example.