# Electric Force of charges A,B,C on another charge

1. Feb 23, 2013

### RichMarrem

1. The problem statement, all variables and given/known data

A, B and C have charges of -2.6, 8.5, and 7.5 microC respectively. These charges are at the points 2.5, 7 and 2 on a straight line where all distances are measured in millimeters from the zero point. What force does a -7.5 microC charge feel if it is at the point 1.2 mm?

2. Relevant equations

F = k(q1q2)/r^2

3. The attempt at a solution

I tried making free body diagrams and then using those to make net force equations but I was unsure how to find the force from the equations.

2. Feb 23, 2013

### ehild

What force acts between two point charges? Show your work.

ehild

Last edited: Feb 23, 2013
3. Feb 24, 2013

### RichMarrem

Would it be F = k(q1q2)/r^2 ?

so between A and the fourth charge,
F = k(2.6*7.5)/(1.3)^2

and so on between B, C and the fourth charge

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