/sci/ - Science & Math

I'm confused with magnetic torque.
For (a) and (b), the magnetic moment would be pointing towards me/away from me. For (a), using the right hand rule, my thumb representing the magnetic moment, is pointing towards me. My index finger (B-field) points to my left, so the rest of my fingers point straight down. Since the torque would be perpendicular to the axis of rotation, there would be no net torque, right? Same with (b)?

But then, looking at (c), the B-field and the magnetic moment would be in the same direction, making their cross product be 0... meaning no net torque. Obviously one of these is wrong.