Electrostatics    Ch 20
Electrostatics   Study of electrical charges that can be collected    and held in one place
Electrical Basics All atoms have a positively charged  nucleus (made up of protons (+) and  neutrons (0) that are surroun...
Conservation of Charge Electric charge is never created or  destroyed, just transferred by the  separation of positive an...
Electrical Materials Conductors – materials through which  charges will move about easily because  they have loosely boun...
Charging a neutral object Conduction – charging a neutral object by  touching it with a charged object Induction – charg...
Coulomb’s Law   The electrical force between 2 charged objects    varies directly with the product of the charges    and ...
Electric Fields     Ch 21
Electric Fields A charge creates an electric field in all  directions The electric field intensity is the force per  uni...
Electric Field Lines             Provide a model for              the electric field. The              strength of the fi...
Electric Potential Difference   Change in Potential Energy per unit    charge; this is often called voltage    difference...
Grounding        Eliminating the         excess charge by         touching a charged         object to the earth         ...
   All charged objects    are on the surface of    a solid conductor   Excess charge will    move to the outer    surfac...
Capacitor        Stores charge; made up         of two oppositely charged         conducting plates         separated by ...
Millikan Experiment             He determined the              charge of an electron              to be 1.6 EE -19 C     ...
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Electrostatics

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Ch 20,21 Notes

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Electrostatics

  1. 1. Electrostatics Ch 20
  2. 2. Electrostatics Study of electrical charges that can be collected and held in one place
  3. 3. Electrical Basics All atoms have a positively charged nucleus (made up of protons (+) and neutrons (0) that are surrounded by electrons (-)) When the positive charge equals the negative charge the atom is neutral Electrons can be removed or transferred by the addition of energy.
  4. 4. Conservation of Charge Electric charge is never created or destroyed, just transferred by the separation of positive and negative charge Like charges repel Opposite charges attract A neutral object will be attracted to a charged object
  5. 5. Electrical Materials Conductors – materials through which charges will move about easily because they have loosely bound electrons; Ex: most metals Insulators - materials through which charges will not move about easily because they have tightly bound electrons; Ex: glass, wood, plastic
  6. 6. Charging a neutral object Conduction – charging a neutral object by touching it with a charged object Induction – charging a neutral object without touching it, but by the separation of charges
  7. 7. Coulomb’s Law The electrical force between 2 charged objects varies directly with the product of the charges and inversely with the square of the distance between them F = kqq’ k = 9EE9 Nm2/C2 d2 A repulsive force is positive because both charges are alike An attractive force is negative because the charges are opposites
  8. 8. Electric Fields Ch 21
  9. 9. Electric Fields A charge creates an electric field in all directions The electric field intensity is the force per unit charge E = F/q units are N/C
  10. 10. Electric Field Lines  Provide a model for the electric field. The strength of the field is indicated by the spacing between lines. The closer the lines the stronger the field. The field always points away from the positive towards the negative charge.
  11. 11. Electric Potential Difference Change in Potential Energy per unit charge; this is often called voltage difference ΔV = ΔPE/q or ΔV = Work/q units are J/C = volts Also ΔV = Ed
  12. 12. Grounding  Eliminating the excess charge by touching a charged object to the earth (low voltage). The charge moves from higher potential to lower potential until they are equal.
  13. 13.  All charged objects are on the surface of a solid conductor Excess charge will move to the outer surface of a hollow conductor
  14. 14. Capacitor  Stores charge; made up of two oppositely charged conducting plates separated by an insulator  Capacitance – ratio of charge stored to potential difference C = q/V units are C/V = 1 Farad (F)
  15. 15. Millikan Experiment  He determined the charge of an electron to be 1.6 EE -19 C  Eq = mg

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