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Two long parallel wires, AB and CD, carr...

Two long parallel wires, AB and CD, carry equal currents in opposite directions. They lie in the x-y plane, parallel to the x-axis, and pass through the points (0,-a,0) and (0,a,0) respectively, Figure. The resultant magnetic field is:

A

zero on the `x`-axis

B

maximum on the `x-` axis

C

directed along the `x`- axis at the origin but not at other points on the`z`-axis

D

directed along the `z`- axis at al points on the `z` -axis

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The correct Answer is:
B, D
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