A long straight wire along the `z`- axis carries a current ` I` in the negative ` z- direction` . The magnetic vector field ` ve

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
A. `(mu_(0)I(yhati-xhatj))/(2pi(x^(2)+y^(2)))`
B. `(mu_(0)I(xhati+yhatj))/(2pi(x^(2)+y^(2)))`
C. `(mu_(0)I(xhatj-yhati))/(2pi(x^(2)+y^(2)))`
D. `(mu_(0)I(xhati-yhatj))/(2pi(x^(2)+y^(2)))`

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 havin

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