1. The problem statement, all variables and given/known data Please open the attachment for the question 2. Relevant equations 1)coulomb's law 3. The attempt at a solution I'm at a loss regarding what to do. Upon reading the question (ignoring the figure), I assumed that the charges will form a square and thus the angle between two adjacent threads will depend on the length of the thread. But the solution key given to me said option (d) was correct. Please help.