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## Homework Statement

Two co-axial, parallel, circular wires of radius R each carrying current I are placed a distance 2d apart. Find an expression for magnetic field B on the axis at distance e from the midpoint between the two loops up to and including terms of 0(e

^{3}).

## Homework Equations

The field for one such loop was calculated to be:

B = (u

_{0}IR

^{2})/(2(z

^{2}+R

^{2})

^{(3/2)})

## The Attempt at a Solution

I'm not sure how the superposition works at all. I've seen it in a few past papers and the method isn't in my notes or the course textbook. (Introduction to Electrodynamics, Griffiths)

Any help or hints on the method would be greatly appreciated!