Arigid wire is put into the shape of a square with side length l. the square has a mass m and carries a current i. the square lies on a horizontal surface(x-y plane) and there is a uniform magnetic field b that is in the +x direction. what is the minimum value of the magnetic field so that one edge of the square will lift off the surface

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).