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A long straight wire in the horizontal plane carries a current of $50\;A$ in north to south direction .What is the direction of B at a point $2.5\;m$ east of the wire ?

$\begin{array}{1 1} \text{Perpendicular , inwards to the plane of paper} \\ \text{Perpendicular outwards to the plane of paper} \\ \text{parallel along the surface to the left of the paper } \\ \text{parallel along the surface to the right of the paper }\end{array} $

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