A piece of copper wire has a resistance per unit length of 5.90 103/m. The wire

Question:

A piece of copper wire has a resistance per unit length of 5.90 × 103Ω/m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.140 m. The ends of the wire are connected to a 12.0-V battery. Find the magnetic field strength at the center of the coil.