() 3 [] A solenoid has 60 turns of wire and a length of 16 cm and supports a current of 10 A. The relative permeability of the core is 1200. The magnetic induction at the center is approximately A 1.4 T B 2.83 T C 5.65 T D 11 T 4 A long, straight wire carries a current of 5.00A. At one instant, a proton, 4.00mm from the wire, travels at 1.50 10 m/s parallel to the wire and in the same direction as the current (Fig. P19.4). (a) Find the magnitude and direction of the magnetic field created by the wire. (b) Find the magnitude and direction of the magnetic force the wire's magnetic field exerts on the proton. x B