Magnetic field due to currentHard
Question
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 coordinate (x, y) on the z = 0 plane is
at a point having coordinate (x, y) on the z = 0 plane isOptions
A.
B.
C.
D.
Solution
Magnetic field at P is
, perpendicular to OP in the direction shown in figure So,
= B sinθ 
- B cosθ 
Here, B =
sin θ =
and cos θ = 
∴
= 
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