A proton has a magnetic field due to its spin on its axis. The field is similar to that created by a circular current loop \(0.650\times10^{-15}\;m\) in radius with a current of \(1.05\times10^4\;A\) (no kidding). Find the maximum torque on a proton in a 2.50-T field. (This is a significant torque on a small particle.)