# Electric Field and two point particles

1. Jan 25, 2009

### fallen186

1. The problem statement, all variables and given/known data
Two point particles separated by 0.4 m carry a total charge of 185 µC.
(a) If the two particles repel each other with a force of 80 N, what are the charges on each of the two particles?
q1=8.05µC
q2=176 µC
*I know they dont add up to 185 but it took both of the answers as correct*
(b) If the two particles attract each other with a force of 80 N, what are the charges on the two particles?

I don't see why it wouldn't be the same answer except one of them would be negative.
According to F=k*$$\frac{|q_{1}*q_{2}|}{r^{2}}$$The type of charge doesn't matter when calculating force.

2. Jan 25, 2009

### LowlyPion

The product of the signs determine direction, as you observed.