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 B at a point having coodinates (x, y) in the z = 0 plane is

`(mu_0 I ( y hati - x hatj ))/( 2 pi ( x^2 +y^2))`

`(mu_0 I (x hati + y hatj))/( 2 pi ( x^2 + y^2 ))`

`( mu_0 i(x hatj - y hati ))/( 2 pi ( x^2 +y^2 ))`

`(mu_0 I ( x I - y hatj ))/( 2 pi (x^2 +y^2))`

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