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When d ≈ a but wires are not touching the loop, it is found that the net magnetic field on the axis of the loop is zero at a height h above the loop. In that case

1. current in wire 1 and wire 2 is the direction PQ and RS, respectively and h ≈ a
2. current in wire 1 and wire 2 is the direction PQ and SR, respectively and h ≈ a
3. current in wire 1 and wire 2 is the direction PQ and SR, respectively and h ≈ 1.2 a
4. current in wire 1 and wire 2 is the direction PQ and RS, respectively and h ≈ 1.2 a

Correct answer: current in wire 1 and wire 2 is the direction PQ and SR, respectively and h ≈ 1.2 a

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