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basic electrostatics

electrostatics for third form revision

Name the two kinds of electric charge. Positive and negative.
What kind of charge do electrons have? negative.
What do charges that are the same do to each other? repel
What do charges that are different do to each other? attract
A cloth rubs a balloon. The balloon becomes negative. What has moved, and which way? electrons, from the cloth onto the balloon.
A positively charged plastic rod is discharged by being connected to Earth. What has moved, and which way? electrons, from Earth onto the rod.
A paint gun is charged and the paint drops spread in fine mist. Why? They all have the same charge and repel each other.
Paint from a charged up paint gun spreads evenly round a metal bike frame. Why? It has the opposite charge and like charges attract.
A fuel tanker is always 'earthed' before petrol is unloaded from it. Why? Friction between tyres and road, or fuel and pipes, can cause electric charge to build up. This could cause spark and explosion.
Why do helicopters get charged up as they fly through the air? friction between rotors and air causes rotors to become charged.
Created by: waslancing