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The magnetic field strength at PP <math>P</math> due to the filament is given by:
<math display="block">{B(r)} = \frac{\mu_0 I}{4 \pi} \sum^n_{i=1} \left(\frac{c_i \times a_i}{|c_i \times a_i|^2}\right) \left(\frac{a_i . c_i}{|c_i|} - \frac{a_i . b_i}{|b_i|}\right)</math>
