# What is the distance of the third charge?

1. Mar 13, 2010

### haengbon

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

Three point charges, 3.0 $$\mu$$c, -5.0$$\mu$$c and 0 $$\mu$$c.

If the distance from point 1 (3.0) and point 2 (-5.0) is 40m, what is the distance from point 2 to point 3?

2. Relevant equations

coulombs law

[b

3. The attempt at a solution

I don't know how to start this :(

2. Mar 13, 2010

### rl.bhat

The problem is not clear. Whether the third body is neutral?
Are they in equilibrium?

3. Mar 13, 2010

### haengbon

I'm not really sure since I only remembered this problem by memory :( but if the third body WAS neutral and they ARE in equilibrium, how would you answer this? :D

4. Mar 13, 2010

### rl.bhat

If the third body WAS neutral and they cannot be in equilibrium

5. Mar 13, 2010

### haengbon

um, if that's so, is it then possible to be solved?

I need to use this formula :D ?

Fe = $$\frac{ Kq1q2 }{ r2 }$$

6. Mar 13, 2010

### ideasrule

No. Just think about it. If the third body is neutral, the other two would attract each other, accelerate towards each other, and eventually collide.