Hey guys! New guy here so bear with me on my first post:) I'm trying to calculate the B field in the center of a finite solenoid for different outer radius sizes. I was able to find a formula online that gave the B field in the center of a solenoid given its length, inner radius, outer radius, number of loops, and current. (sorry guys but I cant include links until I reach 10 posts - add "www" to each link) Formula: .netdenizen.com/emagnet/solenoids/solenoidonaxis.htm Using matlab, I plotted a graph of the B field with the outer radius as the input variable and all other variables constant. Here's the graph I created: L = 0.0254m Inner Radius = 0.008m I = 100A N = 100 Outer Radius varies from 0.008m to 1 m IMAGE: .image-share.com/ijpg-1492-27.htm Shouldn't the B field increase with increasing outer radius due to there being more turns per unit length?