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A straight conductor carriers a current ...

A straight conductor carriers a current alon the `z`-axis Consider the points `A(a,0,0),B(0,-a,0),C(-a,0,0)` and `D(0,a,0)`
(i) All four points have magnetic fields of the same magnitude.
(ii) All four points have magnetic fields of the different direction.
(iii) The magnetic fields at `A` and `C` are in opposite directions
(iv) The magnetic fields at `A` and `B` are mutually perpendicular

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