A solenoid is to be constructed that will have a resistance of 5.00 ohms and produce a magnetic field of 0.0400 T at its center when it carries a current of 4.00 A. The solenoid will be made of wire that is 0.500 mm in diameter and have a radius that is 1.00 cm.The resistivity of the copper wire is 1.70 x 10-8 ohm-m
a) How many turns of wire (N) will be needed to make the solenoid? b) How long will the solenoid be?