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09 elec 01

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  • 1. Introduction to Electrostatics
  • 2. Recall: Atomic StructureAtom 2
  • 3. Recall: Atomic Structurep+ (+ve charge) and n0 (neutral charge) arefound in the nucleus. Protons 3
  • 4. Recall: Atomic StructureNeutrons 4
  • 5. Recall: Atomic StructureThe ONLY time a p+ or n0 leaves the atom isif the atom is radioactive. Nucleus 5
  • 6. Recall: Atomic Structuree- (-ve charge) are found outside thenucleus. They can move between atoms andflow freely.Electrons 6
  • 7. Recall: Atomic StructureNeutral atoms or objects have equal amounts ofe- and p+. +-+ -+-+ -+- 7
  • 8. Recall: Atomic Structure-vely charged atoms or objects have moree- than p+. +--+ -+--+- -+--- 8
  • 9. Recall: Atomic Structure+vely charged atoms or objects have morep+ than e-. +++ -++- 9
  • 10. Introduction to Electrostatics The Greekphilosopher Thales(600 B.C.) was the firstto record electricobservations when herubbed amber withfur.
  • 11. Introduction to ElectrostaticsThe amber could attract small objects.
  • 12. Introduction to ElectrostaticsMaterials that attract other materials afterrubbing are charged.This occurs because electrons move fromone object to another.
  • 13. Introduction to ElectrostaticsA negatively charged object has more electronsthan protons (excess e). +--+ -+--+- -+---
  • 14. Introduction to ElectrostaticsA positively charged object has fewer electronsthan protons (deficit of e ). +++ -++-
  • 15. Introduction to ElectrostaticsA neutral object has an equal number of +ve and -vecharges. +-+ -+-+ -+-
  • 16. Introduction to ElectrostaticsStatic Electricity:Charges that remain stationary on the surface of anobject ("static" means "not moving").
  • 17. Introduction to ElectrostaticsElectrostatics:The study of static electric charge.
  • 18. 3 Laws of Electric Charges1) Like charges repel each other.
  • 19. 3 Laws of Electric Charges2) Opposite charges attract each other.
  • 20. 3 Laws of Electric Charges3) A charged object will attract a neutral object.
  • 21. 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