Electrostatics

Electrostatics

1. Like charges repel opposites attract

2. When an object is rubbed against another they may gain opposite electrostatic charges

   • Only electrons move. NEVER PROTONS

3. The earth is a reservoir of electrons. It can donate or accept charges

   • If we hold a charged object close to the surface we can affect the distribution of charges

4. When we have a highly charged object it is at a very high potential and will take every opportunity to move to a lower potential

   • If we build up the charge so much, it can make the air conductive and excess charge can flow down to earth- this is a spark

5. When an aeroplane is flying it builds up a charge due to air resistance. Because of rubber wheels the plane does not discharge when it touches down. If you try to refuel the airplane a spark may form, and the fuel to make explode. To get round this a metallic rod is attached to the plane and the excess charge flows down to earth