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

AI Thread Summary
The discussion focuses on calculating the electric force experienced by a -7.5 microC charge located at 1.2 mm due to three other charges: A (-2.6 microC), B (8.5 microC), and C (7.5 microC). Participants mention using the formula F = k(q1q2)/r^2 to determine the forces between the charges. The distances between the charges are critical for accurate calculations, with specific attention to the distances from A, B, and C to the -7.5 microC charge. The conversation emphasizes the importance of free body diagrams in visualizing the forces acting on the charge. Overall, the thread aims to clarify the application of Coulomb's law in this scenario.
RichMarrem
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Homework Statement



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?

Homework Equations



F = k(q1q2)/r^2

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.
 
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What force acts between two point charges? Show your work. ehild
 
Last edited:
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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