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Point charges on a line

  • Thread starter map7s
  • Start date
  • #1
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Homework Statement


Two point charges lie on the x axis. A charge of +8.4 µC is at the origin, and a charge of -3.8 µC is at x = 10.0 cm.
At what position x would a third charge q3 be in equilibrium?


Homework Equations


F=(kq1 q2)/r^2


The Attempt at a Solution


I think that my main problem was that I wasn't quite sure how to solve for the distance if I don't have the charge for the third particle or its relation to the other charges.
 

Answers and Replies

  • #2
286
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Then, simply use q3 as the value each time you plug it into your relevant equation. It should cancel out later.
 
  • #3
146
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I tried that, but the q3 doesn't cancel out and I don't know how to get rid of it because they don't state any relationships between the charges. (ex: q1=q, q2=-3q, etc.)
 

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