Calculating Electric Field for 4 Point Charges in a Square Configuration

[nfepow]

Homework Statement

4 point charges are arranged in a Square with side length s=0.5 m. The point charges in the Bottom left and upper right corner has the charge 100nC and the two others has -100nC. A point A is placed on the left side line between the two charges. Determine the field strenght in point A.
A) E=0 N/C
B) E=4.6*10^3 N/C
C) E=1.5*10^4 N/C
D) E=2.4*10^4 N/C
E) E=2.6*10^4 N/C
F) E=3.1*10^4 N/C
G) E=3.5*10^4 N/C

Relevant Equations

I am not given any

I have the following question and I can't figure out how to, is there anybody who can help?

 

[haruspex]

Homework Statement:: 4 point charges are arranged in a Square with side length s=0.5 m. The point charges in the Bottom left and upper right corner has the charge 100nC and the two others has -100nC. A point A is placed on the left side line between the two charges. Determine the field strenght in point A.
A) E=0 N/C
B) E=4.6*10^3 N/C
C) E=1.5*10^4 N/C
D) E=2.4*10^4 N/C
E) E=2.6*10^4 N/C
F) E=3.1*10^4 N/C
G) E=3.5*10^4 N/C
Relevant Equations:: I am not given any

I have the following question and I can't figure out how to, is there anybody who can help?

Per forum rules you must show an attempt.
You must have been taught something about fields generated by point charges.

It is not clear where A is. Was there a diagram? Presumably it is half way along the side.

What is the field at A due to each of the four charges?

 

[nfepow]

I tried to calculate the field first but i couldn't get an answer that made sense

 

[haruspex]

I tried to calculate the field

So post your attempt. Don't be shy.