Question

what is the magnetic induction at appoint 6m from the north pole of strength 150 amp-meter

Answer 1

$$B=\frac{\mu_0}{4\pi}\frac{2M}{r^3}\\ B=\frac{4\pi\cdot10^{-7}}{4\pi}\frac{2(150)}{6^3}=1.4\cdot10^{-7}T$$