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In fig. two long parallel wires carry eq...

In fig. two long parallel wires carry equal currents in opposite directions. Point `O` is situated midway between the wires and `X-Y` plane contains the two wires and the position `Z`-axis comes normally out of the plane of paper. The magnetic field `B` at `O` is non-zero along

A

X, Y and Z axes

B

X-axis

C

Y-axis

D

Z-axis

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