The magnetic field due to current carrying wire at a point P is given by, B2‌‌=‌
µ0
2Ï€
(‌
I
r
) ‌‌=(‌
4π×10−7
2Ï€
)(‌
18
0.6mm×‌
10−3m
1mm
) ‌‌=6×10−3T The magnitude of the resultant magnetic field is given by, B‌‌=√B12+B22 ‌‌=√(8×10−3)2+(6×10−3)2 ‌‌=10×10−3T