Question

11. An isolated unit north pole experiences a force of $$2 \times 10^{-7} \mathrm{N}$$ when kept at a distance of $$1 \mathrm{m}$$ from a magnetic pole in air. The pole strength of the pole is $$\begin{array}{ll}{\text { 1) } 2 \times 10^{7} \mathrm{A}-\mathrm{m}} & {\text { 2) } 2 \mathrm{Am}} \\ {\text { 3) } 2 \times 10^{-7} \mathrm{A}-\mathrm{m}} & {\text { 4) } 4 \mathrm{Am}}\end{array}$$

Answer 1