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A long straight wire along z axis carrie...

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

A

`(mu_0I)/(2pi)(y_i-x_j)/(x^2-y^2)`

B

`(mu_0I)/(2pi)(xhati+yhatj)/(x^2+y^2)`

C

`(mu_0I)/(2pi)(x_i-y_j)/(x^2+y^2)`

D

`(mu_0I)/(2pi)(xhati+yhatj)/(x^2+y^2)`.

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