What are the magnitude and direction of the net force on the third spider (S3) when it is resting at the origin

Complete Question

The complete question is shown on the first uploaded image

The  magnitude is  

Explanation:

From the question we are told that

    The distance between the spiders is  

    The  charge on the is  

     The  charge on is  

Given that the charge are arranged in an equilateral triangle, it implies that the angle at each vertices of the triangle is  60°

Generally the magnitude of net force on is mathematically represented as

So

Here k is the columns constant with value  

So

=>  

From the diagram we see that

So

Now from the diagram the ls [tex]270^o[\tex] counterclockwise from x-axis

are there options? cause you ain’t. real specific