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## Main Question or Discussion Point

The formula for Helmholtz coil is given by mu*(0.8^1.5)*nI/R, where I is the current, n is te number of coil and R is the radius of the coil.

Now assume the bunch of coils have a small 'thickness' w (so it looks like a hollow cylinder with a very small height), and the the two coils are separated by R' (R' is measured from the two inner most coils). How should I set-up the integral using Biot-Savart Law (or other method) to find the expression for B-field for this 'non-ideal' Helmholtz coil?

Now assume the bunch of coils have a small 'thickness' w (so it looks like a hollow cylinder with a very small height), and the the two coils are separated by R' (R' is measured from the two inner most coils). How should I set-up the integral using Biot-Savart Law (or other method) to find the expression for B-field for this 'non-ideal' Helmholtz coil?