[SOLVED] Magnetic Field due to a current loop 1. The problem statement, all variables and given/known data A single loop of wire of radius 3 cm carries a current of 2.6 A. What is the magnitude of B on the axis of the loop at 2 cm? 2. Relevant equations B=[tex]\mu[/tex]/(4[tex]\pi[/tex]) * 2[tex]\pi[/tex](R^2)*I/(z^2+R^2)^(3/2) 3. The attempt at a solution I = 2.6 A R = .03 m z = .02m I calculate .000031 T It should just be a simple matter of plugging in numbers, but every time I use this equation it ends up being wrong. If anyone could tell me what I might be doing wrong it would be greatly appreciated.