# Net electric forces on a point charge

## Homework Statement

In the figure, what is the force on charge Q3?
Q1 = 5×10-6C, Q2 = -3×10-6C, Q3 = 4×10-6C
http://www.usi.edu/science/physics/pickett/206/4p2f1.jpg [Broken]

Coulomb's law

## The Attempt at a Solution

I thought I could just find the charges on q1 and 3 and then on 2 and 3 and add them but I don't think that is right. Can you just add electrical forces?

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berkeman
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## Homework Statement

In the figure, what is the force on charge Q3?
Q1 = 5×10-6C, Q2 = -3×10-6C, Q3 = 4×10-6C
http://www.usi.edu/science/physics/pickett/206/4p2f1.jpg [Broken]

Coulomb's law

## The Attempt at a Solution

I thought I could just find the charges on q1 and 3 and then on 2 and 3 and add them but I don't think that is right. Can you just add electrical forces?
Yes, use Coulomb's law and sum the 2 forces on Q3 to get the total force on Q3.

Last edited by a moderator: