Find the electric current required.

[Kakos87]

Hello guys,

I am attaching an exercise and the the given answer. I have two questions regarding the answer.

1. There is one more force on the cylinder that creates an anticlockwise torque about its center of mass, and this is the component of its weight that is in the direction of the surface (pointing down the slope). Why didn't the exercise consider that force for the overall torque, as well?

2. As per the answer: each side of the coil exerts a magnetic force Fm = NBil. But this is the equation regarding a magnetic force's magnitude on a wire only in case that the magnetic force and the wire are perpendicular to one another, which here is not the case.

Thank you guys.