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

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

G1 Physics · Accepted Answer

For current along −z, B⃗=(μ₀I/2πρ²)(y î−x ĵ), where ρ²=x²+y², by the right-hand rule. This is option A.