Electric field strength from x=-a to x = a

[physiccool78]

Homework Statement

I attached a file.

Numbers 10 and 12.

Homework Equations

kQq/r, kQq/r^2

The Attempt at a Solution

I am confused about this problem. Shouldn't the electric field strength be 0 when x = 0? The charges are opposite and adding two opposite vectors with equal magnitude should be 0 right? So how come the answer says that the electric field strength is the greatest at x = 0 then? Thank you.

 

[LittleMrsMonkey]

They are in opposite positions on the y axis,so the vectors of the electric fields point in the same direction.They both point to the negative charge.

 

[physiccool78]

Wow... Thank you and now I feel embarrassed for asking this question! I can't believe I overlooked this. Thank you.

 

[LittleMrsMonkey]

Just be a little more patient with physics problems,however simple or confusing they might be.