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Find the inductance of a unit length of two parallel wires, each of radius \( a \), whose centers are a distance
\( \mathrm{P} \) \( d \) apart and carry equal currents in opposite

W directions. Neglect the flux within the wire
(1) \( \frac{\mu_{0}}{2 \pi} \ln \left(\frac{d-a}{a}\right) \)
(2) \( \frac{\mu_{0}}{\pi} \ln \left(\frac{d-a}{a}\right) \)
(3) \( \frac{3 \mu_{0}}{\pi} \ln \left(\frac{d-a}{a}\right) \)
(4) \( \frac{\mu_{0}}{3 \pi} \ln \left(\frac{d-a}{a}\right) \)
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