An isolated unit north pole experiences a force of 2 × 10–7 N when kept at a distance of 1m from a magnetic pole in air. The pole strength of the pole is

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An isolated unit north pole experiences a force of 2 × 10^–7N when kept at a distance of 1m from a magnetic pole in air. The pole strength of the pole is

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2 × 10⁷ A-m

2 A-m

2 ×10^–7 A-m

4 A-m

answer is B.

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Detailed Solution

$\begin{aligned} m_{2} = F \frac{4 π}{μ_{o} m_{1}} r^{2} \\ m_{2} = \frac{2 \times 10^{- 7} \times 10^{7} \times 1}{1} \\ m_{2} = 2 A - m \end{aligned}$