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<math>\frac{F} {l} = k_\mathrm{e} \frac{I_\mathrm{1} I_\mathrm{2}}{d}</math> </br>
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<math>\frac{F} {l} = k_\mathrm{e} \frac{I_\mathrm{1} I_\mathrm{2}}{d}</math> </br>
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