# Homework Help: Coulomb's law and drawing vectors

1. May 29, 2007

### spastic3

1. The problem statement, all variables and given/known data
Three charges are on the x~axis about five cm apart. Charge A is three micro C, charge B is negative four micro C, and charge C is five micro C. What is the effect on B?

2. Relevant equations
I have no idea how to solve this or the formula involved.

3. The attempt at a solution

Completely clueless, just would like to know how to solve it.

2. May 29, 2007

### dontdisturbmycircles

Coulomb's law. Draw the force vectors calculated for both $$F_{a->b}$$ and $$F_{c->b}$$.

$$F_{e}=\frac{Kq_{1}q_{2}}{r^{2}}$$

3. May 29, 2007

### spastic3

sorry i'm lost, i have no idea how to implement that. what are force vectors?

4. May 29, 2007

### dontdisturbmycircles

Its ok. Did you draw a diagram? Start by drawing a diagram. I am assuming that A is on the left of B and B is on the left of C, right?

Does A exert a force to the left or the right on B?

How about C, does it exert a force to the left or the right on B?

5. May 29, 2007

### dontdisturbmycircles

Hint: think opposites attract.. Which of the charges are positively charged? Which are negatively charged?

6. May 29, 2007

### spastic3

how do you draw the diagram? i'm completely confused, you're talking to me in riddles. do you know of a website that shows step by step how to work these type of problems?