# Electrostatics problem

1. Nov 25, 2006

### metalmagik

Particles of charge Q1 = +62 µC, Q2 = +45 µC, and Q3 = -80 µC are placed in a line (Fig. 16-37). The center one is 0.35 m from each of the others. Calculate the net force on each charge due to the other two.

I have found the forces between Q1 - Q2, Q2 - Q3, and Q1 - Q3.

Here is my work for Q1 - Q2:

$$F = kq1q2/r^2 F = (8.99e9)(62e6)(45e6)/(.35)^2 F = 2.05e26 N$$

I entered this Force value in for Q1

Force on Q1:
Magnitude
_______ N
Direction
right
up
left
down

and it marked me wrong, though I got the direction right. Am I not using the right force for Q1 or something? I am quite confused with this, any help would be very appreciated, thank you.

2. Nov 25, 2006

### metalmagik

I realized I used µ wrong, and that it is $$10^-6$$ but I am still getting the wrong answer. I am veryy lost and confused. Maybe I should try doing this tomorrow instead of at 1 AM. but any help is appreciated.

3. Nov 26, 2006

### metalmagik

I am bumping this so someone can pelaseee help me with this question. I am unsure of which force value applies to which particle...for Q1 it says the force is 114 N. I got like...208 N for the Force between Q1 and Q2. Please someone help!