A long staright wire along the z axis ca...

A long staright wire along the z axis carries a current I in the negative z direction the magnetic vector field `vecB` at a point having coordinates (x,y) in the z=0 plane is

`(mu_0i)/(2pi)((yhati-xhatj))/((x^2+y^2))`

`(mu_0i)/(2pi)((xhati-yhatj))/((x^2+y^2))`

`(mu_0i)/(2pi)((xhatj-yhatj))/((x^2+y^2))`

`(mu_0i)/(2pi)((xhati-yhatj))/((x^2+y^2))`

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