Magnetic Field & Cathode Ray Tube

Two solenoids are used to produce a magnetic field across a cathode-ray tube. Each coil has N=6000 turns, is L=0.09m long, has radius r=0.06m, and carries current I=1.2A. The CRT is d=0.07m in diameter.

(a) Find what field would be in the CRT if it as inside an infinite solenoid with the same radius …