Problem -- need direction Hey all, I just need a lil prodding in the right direction, I'm not totally sure where to start on this problem. Figure 29.38 shows a wooden cylinder with mass m = .25 kg and length L = .7 m, with N = 20 turns of wire wrapped around it longitudinally, so that the plane of the wire coil contains the axis of the cylinder. What is the least current 'i' through the coil that will prevent the cylinder from rolling down a plane inclined at an angle theta to the horizontal, in the presence of a vertical, uniform magnetic field of 0.75 T, if the plane of the windings is parallel to the inclined plane? Don't have a picture, but Fig 29.38 has a wooden cylinder on a slope, with the attributes as above. I'm trying to balance the equation out, but I'm getting nowhere as I'm neglecting length L and N turns. I figure net force/torque should be 0, but I can't get anywhere from that. Thanks.