anonymous
  • anonymous
Two identical objects each with a charge of +3.0 μC experience a repulsive force of +0.90 N between them. How far apart are the objects? A. 0.10 m B. 0.20 m C. 0.30 m D. 0.90 m
Physics
chestercat
  • chestercat
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Michele_Laino
  • Michele_Laino
we have to apply the law of Coulomb \[F = K\frac{{{Q_1}{Q_2}}}{{{d^2}}}\]
anonymous
  • anonymous
ok! what do we plug in? :/
Michele_Laino
  • Michele_Laino
so we can write: \[d = \sqrt {K\frac{{{Q_1}{Q_2}}}{F}} = \sqrt {9 \times {{10}^9}\frac{{3 \times {{10}^{ - 6}} \times 3 \times {{10}^{ - 6}}}}{{0.9}}} \]

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anonymous
  • anonymous
ok! and we get 0.3 ?
anonymous
  • anonymous
and choice C is our solution?
Michele_Laino
  • Michele_Laino
that's right!
anonymous
  • anonymous
yay! thanks!!:)
Michele_Laino
  • Michele_Laino
:)

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