static electricity

• example

  • The balloon is rubbed on a jumper
  • electrons from the jumper move to the balloon
  • balloon becomes negative
  • jumper becomes positive
  • the balloon is placed on a wall
  • electrons in the wall repel as the balloon is also negative
  • this makes the surface of the wall positive
  • opposite charges attract so the balloon sticks to the wall
• electric field - area surrounding a charged object
• radial field diagram if positive

  • arrows point outwards
  • the closer the lines are the stronger the force
• radial field diagram if negative

  • arrows point inwards
  • the closer the lines are the stronger the force