Problem 8: Another Solenoid A solenoid is constructed by winding a wire onto a dielectric cylinder of radius a and length 4. The wire is wound around until the outer radius of the solenoid is b. Since d > b, end effects may be neglected throughout this problem. The cross-sectional area occupied by an individual strand of wire is A, so that a total of N = (b a)d /A turns of wire comprise the solenoid. You should assume that N is a very large number (Fig. 18.15). Loop of resistance R -~ 5 Fig. 18.15 Schematic of the solenoid for \"Another solenoid\