question_answer

Two long parallel wires carry equal current I flowing in the same direction are at a distance 2d apart. The magnetic field B at a point lying on the perpendicular line joining the wires and at a distance x from the midpoint is -

A) \[\frac{{{\mu }_{0}}id}{\pi ({{d}^{2}}+{{x}^{2}})}\]           

B) \[\frac{{{\mu }_{0}}ix}{\pi ({{d}^{2}}-{{x}^{2}})}\]

C) \[\frac{{{\mu }_{0}}ix}{({{d}^{2}}+{{x}^{2}})}\]    

D) \[\frac{{{\mu }_{0}}id}{({{d}^{2}}+{{x}^{2}})}\]