Recall: Atomic StructureThe ONLY time a p+ or n0 leaves the atom isif the atom is radioactive. Nucleus 5
Recall: Atomic Structuree- (-ve charge) are found outside thenucleus. They can move between atoms andflow freely.Electrons 6
Recall: Atomic StructureNeutral atoms or objects have equal amounts ofe- and p+. +-+ -+-+ -+- 7
Recall: Atomic Structure-vely charged atoms or objects have moree- than p+. +--+ -+--+- -+--- 8
Recall: Atomic Structure+vely charged atoms or objects have morep+ than e-. +++ -++- 9
Introduction to Electrostatics The Greekphilosopher Thales(600 B.C.) was the firstto record electricobservations when herubbed amber withfur.
Introduction to ElectrostaticsThe amber could attract small objects.
Introduction to ElectrostaticsMaterials that attract other materials afterrubbing are charged.This occurs because electrons move fromone object to another.
Introduction to ElectrostaticsA negatively charged object has more electronsthan protons (excess e). +--+ -+--+- -+---
Introduction to ElectrostaticsA positively charged object has fewer electronsthan protons (deficit of e ). +++ -++-
Introduction to ElectrostaticsA neutral object has an equal number of +ve and -vecharges. +-+ -+-+ -+-
Introduction to ElectrostaticsStatic Electricity:Charges that remain stationary on the surface of anobject ("static" means "not moving").
Introduction to ElectrostaticsElectrostatics:The study of static electric charge.
3 Laws of Electric Charges1) Like charges repel each other.
3 Laws of Electric Charges2) Opposite charges attract each other.
3 Laws of Electric Charges3) A charged object will attract a neutral object.
3 Laws of Electric Charges3 important rules:i) Objects with like charges repel each other.ii) Objects with opposite charges attract.iii) Neutral matter is attracted to charged matter. Charge Charge Attract or Repel? +ve +ve Repel -ve -ve Repel +ve -ve Attract Neutral +ve Attract Neutral -ve Attract 21