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Magnetic Flux Density at different points about a solenoid

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Mar25-09, 08:44 PM
P: 1
1. The problem statement, all variables and given/known data
For my physics investigation I am required to first find the theoretical magnetic flux denisty at different points about a solenoid. The points are outside the solenoid: along the axis but past the ends and; perpendicular to the centre of the solenoid but outside.

So far I have looked at many links to Biot-Savart law, but they only seem to show equations for a loop and not a solenoid.

2. Relevant equations
I have tried for the point along the axis:

but it only works with in the confines of the solenoid.

I also tried:

but it doesn't work for the solenoid.

What I basically need is two equations, one for the axis, and, one for the points perpendicular to the centre.
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Dec28-09, 04:24 AM
P: 31
i was looking for this same equation a few months ago, bloody hard thing to find but i found it!

for a thin shell solenoid use the equation found here:

for a solenoid with a shell use the equation found here:

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