Two long parallel wires, AB and CD, carry equal currents in opposite directions. They lie in the xy plane, parallel to the x-axis, and pass through the points (0, –1, 0) and (0, 1, 0) respectively. The resultant magnetic field is

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zero on the x-axis

maximum on the x-axis

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

none of these

answer is B.

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Detailed Solution

∵ Field on the x-axis due to both current are same (along + z-axis) which is minimum distance between them.

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