Equal currents i = 1 A are flowing through the wires parallel toy-axis located at x = +1 m, x = +2 m, x = +4 m etc. but in opposite directions as shown. The magnetic field at origin (in T) would be

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−1.33 × 107 k^

1.33 × 10−7 k^

2.67 × 10−7 k^

−2.67 × 10−7 k^

answer is B.

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Detailed Solution

B→= μ02π 11 + 14 + 116 +k^− 12+18 +... k^ =μ02π 11-12 k^− 12 11−14k^ = 23 μ02π k^= 23 × 2 × 10−7k^= 1.33 × 10−7 k^

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