# How do electrical charges attract/repel each other

Ok. I understand like repel and opposite attract. There are these physics homework with 3 charges and find the force from 2 of them on one. I understand the math: the only problem is my signs are wrong due to not understanding the direction of the force.

For example,
There's a positive charge (A) on origin. There's a positive charge (B) 4 meters up. There's a neg charge (C) 3 meters x axis and 4 meters y axis. Find the resultant vector on charge 3?

For me, I would make charge 3 my main object. It would then attract and pull Charge B, making a vector to the SOutheast. It would then pull charge A to the NE direction. Then the resultant vector would be to right. But I am wrong.

Drakkith
Staff Emeritus
If you're trying to find the vector of charge C, then you need to find out which direction the other 2 charges are pulling on it, not which way charge C is pulling the other two.

So the resultant is to the left?

Drakkith
Staff Emeritus