summary

• Charges come in two varieties

  • negative and positive
  • in a conductor, negative charge means extra mobile electrons, and positive charge means a deficit of mobile electrons

• Coulomb Force
  • bi-linear in charges
  • inversely proportional to square of separation
  • central force

• Electric field

• Reading assignment: Tipler 22.4-7 and 23.1

• study examples 22.8,9&11 and 23.1&2

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