Coulomb�s Law by hyRLTrT

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									Coulomb’s Law
              Electric Force
   Symbol: Fel

   Definition: the attractive or repulsive
    force between any 2 charged
    objects.
            Coulomb’s Law
   Used to determine the force of the
    charge between two objects.
   Coulomb found that the force is
    inversely proportional to the squared
    distance between the two objects
                 F = 1 / d2
            (look familiar!?!?!?)
              Coulomb’s Law
               Fel = K x q1 x q2
                            d2
   Fel = force of electric charge (N)
   K = electrical constant (9.0 x 109 Nm2/C2
   q = amt. of charge on object (measured
    in Coulombs, C)
   d = distance between objects (meters)
   Answer is (-) when force is attractive
   Answer is (+) when force is repulsive
        Inverse Square Law
 Fel is proportional to 1/d2
 Ex. double distance

    •Fel’ = 1/ (2)2 = ¼ Fel
   Ex. cut distance in ½
    •Fel’ = 1/ (1/2)2 = 1/(1/4) = 4
     Fel
                 Practice
   Cut the distance by 1/3
    • Fel increases by 9 times
          Coulomb
 Unit of charge
 1C = 6.25 x 10   18 e-

 A bolt of lightening transfers

  1-20 Coulmbs
                Coulomb’s Law
   Find Fel:

                         2m


     q = 4.80 x 10-7 C        q = 3.20 x 10-7 C

   3.46 x 10-4 N

								
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