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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?