1. The problem statement, all variables and given/known data A circular 10 turn coil that has a radius of 0.05 m and current of 5A lies in the xy plane with a uniform magnetic field B = 0.05 T i + 0.12 T k (i and k are the unit vectors). What's the potential energy for the system??? 2. Relevant equations U = -m*B where m is the dipole moment = I*A 3. The attempt at a solution B = sqrt((0.05 T)^2 + (0.12 T)^2) = 0.13 T So for this I would get U = -0.00511 J, but the answer key says -0.000472 J... where's the mistake???