Coulomb's Law (Electric Force) Video Lessons

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Problem: An atomic nucleus has a charge of +40e. An electron is 10-9 m from the nucleus. What is the force on the electron?A) 2.9 nN B) 9.2 nNC) 3.7 nN D) 1000 C E) 6.8 nN

FREE Expert Solution

From Coulomb's law:

F=kq1q2r2

  • k = 8.99 × 109 Nm2/C2 (Coulomb's Constant)
  • q1 = 40 (1.6 × 10-19) C
  • q2 = 1.6 × 10-19C
  • r = 10-9m

Substituting gives:

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Problem Details

An atomic nucleus has a charge of +40e. An electron is 10-9 m from the nucleus. What is the force on the electron?

A) 2.9 nN 

B) 9.2 nN

C) 3.7 nN 

D) 1000 C 

E) 6.8 nN

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