Charges of 5 10^-9 C and -4 10^-9 C are 0.02 m apart in free space. The force between them is (k = 8.99 10^9 N m^2 C^-2):

  1. 8.99 10^-6 N, attractive
  2. 4.49 10^-4 N, repulsive
  3. 8.99 10^-4 N, attractive
  4. 4.49 10^-4 N, attractive
Answer

D) 4.49 10^-4 N, attractive

F = kq1q2r^2 = 4.49 10^-4 N; unlike charges attract. SLO P-11-E-07 · Application

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