Hi everyone. I have a confusion over a certain concept. I know the torque for a rotating coil in a uniform magnetic field is BIAN. But what if the coil is at a certain degree to the magnetic field? http://img44.imageshack.us/img44/1926/magnetic.th.png [Broken] Sorry for the bad drawing. My interpretion: Ok, so the current is still perpendicular to the B-field (into/out of paper), even if there is an inclination. The formula should still be BIAN right? Assessment Book answer: If the magnetic field is uniform, the component of B which is effective is Bcosα, and torque=(Bcosα)IAN. [WHY???] Further question: Whats the difference between a radial magnetic field and a uniform magnetic field? Thanks. Just a little confused since this is a new topic for me. EDIT: Typo errors.