Problem: A piece of copper wire has a resistance per unit length of 6.00 x 10-3 ohm/m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.240 m. The ends of the wire are connected to a 12.0-V battery.
1- Find the magnetic field strength at the center of the coil.
Show me the each and every step of calculation.