A certain superconducting magnet in the form of a solenoid of length 0.500 m can generate a magnetic field of 9.00 T in its core when its coils carry a current of 75.0 A. a) Find the number of turns in the solenoid. b) If a single proton is shot into one end of the solenoid such that it is originally traveling along the central axis, what direction would the force on the proton from the magnetic field be pointed in (if it acts on the proton at all)?