anonymous
  • anonymous
Two objects, each with a charge of +5.0 × 10^-5 C, are separated by 0.50 m. What is the magnitude and type of force between them? A. -90 N, attractive B. -45 N, repulsive C. +45 N, attractive D. +90 N, repulsive
Physics
chestercat
  • chestercat
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Michele_Laino
  • Michele_Laino
please wait a moment
anonymous
  • anonymous
ok!
Michele_Laino
  • Michele_Laino
the force is repulsive, since both charges are positive

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anonymous
  • anonymous
ok! so it is either B or D? how can we find out which one?
Michele_Laino
  • Michele_Laino
the magnitude of that force, is given by the Coulomb's law: \[\large F = K\frac{{{Q_1}{Q_2}}}{{{d^2}}} = 9 \times {10^9}\frac{{5 \times {{10}^{ - 5}} \times 5 \times {{10}^{ - 5}}}}{{{{\left( {5 \times {{10}^{ - 1}}} \right)}^2}}}\]
anonymous
  • anonymous
ok! we get 90? so our solution is choice D?
Michele_Laino
  • Michele_Laino
that's right!
anonymous
  • anonymous
yay!! thank you!!
Michele_Laino
  • Michele_Laino
:)

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