When $$d \approx a$$ 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

A

current in wire 1 and wire 2 is the direction PQ and RS, respectively and $$h \approx a$$

B

current in wire 1 and wire 2 is the direction PQ and SR, respectively and $$h \approx a$$

C

current in wire 1 and wire 2 is the direction PQ and SR, respectively and $$h \approx 1.2a$$

D

current in wire 1 and wire 2 is the direction PQ and RS, respectively and $$h \approx 1.2a$$