1. The problem statement, all variables and given/known data Find the magnetic field at the point distance R outside a rectangular loop of sides 2R, 4R carrying current I as shown in the attached diagram 2. Relevant equations Biot-Savart Law 3. The attempt at a solution Could I just break this up into 4 separate lines and then calculate using the Biot-Savart Law for a finite wire? The magnetic field at the point, P, would then be the sum of the magnetic fields due to each line, no?