function(optotal(t),vector(x,y))=vector(x-cos(n),y-sin(n))/[[x-cos(n)]^2+[y-sin(n)]^2]^(3/2)-vector(x+cos(n),y+sin(n))/[[x+cos(n)]^2+[y+sin(n)]^2]^(3/2)+1/2*vector(1,0)

A dipole field embedded in a uniform field, resulting in a pair of nulls.

Graph of the formula

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