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.