A solenoid is to be prepared whose magnetic field strength at the center is 3.2 mT if is carries a current of 3.5 A. This is to be made up of copper wire whose diameter is 0.25 mm. The radius of the solenoid is to be 1.5 cm and length of 30.0 cm.
Determine how many turns of wire are required and the minimum numbers of layers will this acquire?