1. The problem statement, all variables and given/known data In a wire passes the current I=21A. A part of the wire is bent to form three consecutive sides of a square with sides 40 cm. Find the induction of the magnetic field in the point O which is the center of the square. 2. Relevant equations B=I*μ0*/2*pi*d 3. The attempt at a solution I want to know if my sketch is correct. I think I know the rule of the Right Hand but I don't know to draw it correctly in a plan. Here's what I did. http://postimg.org/image/ynx280cdb/ Can you correct it?