A long straight wire along the z-axis ca...

A long straight wire along the z-axis carries a current I in the negative z-direction. The magnetic vector field `vec(B)` at a point having coordinnates (x, y) in the z = 0 plane is

`(mu_(0) I (y hati-x hatj))/(2pi(x^(2)+y^(2)))`

`(mu_(0) I (x hati +yhatj))/( 2pi( x^(2)+y^(2)))`

`(mu_(0)I (x hatj -yhati))/( 2pi(x^(2) +y^(2)))`

`(mu_(0) I (x hati -yhatj))/(2pi (x^(2) +y^(2)))`

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