Two circular coils are concentric and lie the same plane. The inner coil contains 120 turns of wire, has a radius of 0.017 m, and carries a current of 7.8 A. The outer coil has a radius of 0.033 m and carries a current of 15.1 A. A) What is the number of turns in the outer coil, such that the net magnetic field at the common center of the two coils is zero? B) What is the magnetic field strength experience by both? C) If the outer coil was the only coil what would be its maximum torque?