A long straight wire along the `z- axis` carries a current ` I` in the negative ` z- direction` .
Channel: Doubtnut
Date: 2020-07-05

Please adA 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