1.

A long straight wire along the z-axis carries a current I in the negative z direction. The magnetic vector field \[\overset{\to }{\mathop{B}}\,\] at a point having coordinates (x, y)  in the z = 0 plane is  [IIT-JEE (Screening) 2002]

A. \[\frac{{{\mu }_{o}}I\,(y\hat{i}-x\hat{j})}{2\pi ({{x}^{2}}+{{y}^{2}})}\]   
B. \[\frac{{{\mu }_{o}}I\,(x\hat{i}+y\hat{j})}{2\pi ({{x}^{2}}+{{y}^{2}})}\]
C. \[20\,\,A{{m}^{2}}\]   
D. \[\frac{{{\mu }_{o}}I\,(x\hat{i}-y\hat{j})}{2\pi ({{x}^{2}}+{{y}^{2}})}\]
Answer» B. \[\frac{{{\mu }_{o}}I\,(x\hat{i}+y\hat{j})}{2\pi ({{x}^{2}}+{{y}^{2}})}\]


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