4π×10−7Tm−1A4 \pi \times 10^{-7} \mathrm{Tm}^{-1} \rm{A}4π×10−7Tm−1A
4π×10−7TmA−14 \pi \times 10^{-7} \mathrm{Tm} \mathrm{A}^{-1}4π×10−7TmA−1
4π×10−7T−1mA4 \pi \times 10^{-7} \mathrm{T^{-1}m} \mathrm{A}4π×10−7T−1mA
4π×10−7Tm−1A−14 \pi \times 10^{-7} \mathrm{Tm^{-1}} \mathrm{A}^{-1}4π×10−7Tm−1A−1
