A long straight wire along the z -axis carries a current I in the negative z direction…
Physics · JEE Advanced · NTA Exams — Magnetic Effects of Current and Magnetism
A long straight wire along the z-axis carries a current I in the negative z direction. The magnetic vector field 
at a point having coordinates (x, y) in the z = 0 plane is
at a point having coordinates (x, y) in the z = 0 plane is
Answer
(B)
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