Coulombs Law
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Coulombs Law

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Coulombs Law Coulombs Law Presentation Transcript

  • Coulomb’s Law Electric Force and Electric Field
  • Coulomb's Law
    • Coulomb determined
      • Force is attractive if charges are opposite sign
      • Force is proportional to the product of the charges q 1 and q 2 and is along the lines joing them
      • Force inversely proportional to the square of distance between the charges
    • i.e.
      • |F 12 |  |Q 1 | |Q 2 | / r 12 2
      • or
      • |F 12 |= k |Q 1 | |Q 2 | / r 12 2
  • Coulomb's Law
    • Units of constant can be determined from Coulomb's Law
    • Colomb (and others since) have determined this constant which (in a vacuum) in SI units is
      • k = 8.987.5x10 9 Nm 2 C -2
    • k is normally expressed as k = 1/4  0
      • where is the permittivity of free space
  • Coulomb's Law
  • Vector form of Coulomb’s Law Q1 Q2 r 12 r 12 is a vector connecting the two charges. is a unit vector in this direction + + + -
  • Sample Problem Resultant F on P = F BP – F AP = 2.62  10 -5 N. Direction: To the left (attraction) P B A + - + 6 cm 4 cm 2 nC 5 nC 1 nC
  • Force from many charges Superposition
  • Force from many charges Q1 Force on charge is vector sum of forces from all charges Principle of superposition + - Q2 + Q4 - Q3