Line of uniformly distributed charge

Ex = xl?xr (k l dx / r2 ) cos(q) and

Ey = xl?xr (k l dx / r2 ) sin(q) .

A diagram should help with the geometry:

r = ?(x2 + a2) cos(q) = -x/r sin(q)= a/r .

* (field point)

ri a

qi

Dqi -xi

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