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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a
zero on the x-axis
b
maximum on the x-axis
c
directed along the z-axis at the origin, but not at other points on the z-axis
d
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.