Question

Basic electricity problem

Answer 1

I have four electric charges. They are in the next setting:

Answer 2

The size of the square is l

Answer 3

Demostrate that q and Q are of opposite signs and also find the value of Q/q

Answer 4

For demostrating...should I just say Ft=F1+F2+F3 and do that?

Answer 5

coulombs law is the answer or Gauss law if we draw the vector diagram of the force we can find the answer

Answer 6

So I get Fq1 +Fq2 = FQ...my teacher jumped from this to
FQ= Fq* sqrt(2) ... I could answer after getting this, but I dont understand the change