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Coco12
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Homework Statement
Find the net electric field strength at point A due to the combined electric fields of both charges.
Homework Equations
E=kq/d^2
The Attempt at a Solution
I know how to solve these type of problems however I'm just wondering how come in the net force line as you can see on my paper, they didn't use a -3.7*10^7 since it is going in the left direction.
The answer that was given was : 3.7*10^7+ 7.71*10^6 = 4.5*10^7 N/C
When I did electrostatic forces before that had charges in a line, you had to use negative when finding net force for charges that went to the left..