Coulombs law question

  • Thread starter yoshiba
  • Start date
  • #1
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Homework Statement


What is the magnitude of the force a +12 µC charge exerts on a +2.7 mC charge 43 cm away?


Homework Equations


I know I have to use the equation: F=kq1q2/r^2



The Attempt at a Solution


F=(9*10^9)(12)(2.7)/(43^2)
=157706868.6

???right???
 

Answers and Replies

  • #2
99
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The Attempt at a Solution


F=(9*10^9)(12)(2.7)/(43^2)
=157706868.6
???right???

almost, attention to the unit system you are using....
 
  • #3
7
0
so i would change mC to C and cm to m...
F=(9*10^9)(2.7*10^-6)(12*10^-6)/(.43^2)
=1.58 N

is this ok?
 
Last edited:

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