1. The problem statement, all variables and given/known data A projecticle launcher is shown in the attachment. A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar touching the rails. A magnetic field is perpendicular to the plane of the circuit. If the bar has a length L=0.22 m and a mass of 0.0015 kg and is placed n a field of 1.7 T, what constant current flow is needed to accelerate the bar from rest to 28 m/s in a distance of 1.0 m? In what direction must the magnetic field point? 2. Relevant equations F=ma F=ILB 3. The attempt at a solution I'm having a hard time conceptualizing this problem and would like any assistance. Thank you.