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

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 coordinates (x,y) in the ` Z = 0` plane is

`(mu_(0)I(yhat(i)-xhat(j)))/(2pi(x^(2)+y^(2)))`

`(mu_(0)I(xhat(i)+yhat(j)))/(2pi(x^(2)+y^(2)))`

`(mu_(0)I(xhat(j)-yhat(i)))/(2pi(x^(2)+y^(2)))`

`(mu_(0)I(xhat(i)-yhat(j)))/(2pi(x^(2)+y^(2)))`

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