People have proposed driving motors with the earth's magnetic field. this is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques. suppose a 16-cm-diameter loop of wire is oriented for maximum torque in the earth's field.

what current would it need to carry in order to experience a very modest 1.0�10? 3n? m torque?

Aproduction line at v. j. sugumaran's machine shop has three stations. the first station can process a unit in 7 minutes. the second station has two identical machines, each of which can process a unit in 16 minutes (each unit only needs to be processed on one of the two machines). the third station can process a unit in 10 minutes. ▼ is the bottleneck station, with a bottleneck time of nothing minutes per unit (enter your response as a whole number).