An engineer wants to design a toy racetrack using an electromagnetic rail gun (see Problem 122) to accelerate a car of mass 40 g starting from rest. The horizontal rails are to be 1.0 m long and 2.0 cm apart. The magnetic field in the rail gun is to be 0.10 T upward. Leaving the rail gun, the car slides onto a horizontal track and then around a vertical loop-the-loop of radius 15 cm. Ignore friction everywhere. What minimum current must flow in the rails to give the car enough kinetic energy to make it around the loop without losing contact with the track? Is the required current reasonable?