Coulomb's Law (Finding magnitude & direction of net force)

  • Thread starter csgirl504
  • Start date
  • #1
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Homework Statement



Three positive particles of equal charge, +11.5 µC, are located at the corners of an equilateral triangle of side d = 13.0 cm (Fig. 16-50).

Calculate the magnitude and direction of the net force on each particle.

Image is here: http://www.webassign.net/giancoli5/16-38alt.gif


Homework Equations



k*|q1||q2| / r2



The Attempt at a Solution



Solving for net force on Q1:
Ok, I drew a free body diagram. The force from q2 goes up and to right, q3 goes up and to left. I thought that since the x values will be the same due to symmetry, I could cancel them out and solve for the y value.

So, I can find one force and multiply by two since they will be the same.

I did 2 * { (9e9 * 11.5e-6 * 11.5e-6)/132 } * sin60

I multiplied by sin60 to get the y value.

My answer is coming out to be .0122, which is wrong. I'm not sure what I'm doing wrong. Can someone please explain? Thanks!
 

Answers and Replies

  • #2
25
1
Check your units for d! :)
 

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