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Find the inductane of a unit length of...

Find the inductane of a unit length of a double line if the radius of each wire is `eta` times less than the distance between the axes of the wires. The field inside the wires is to be neglected, the permeability is assumed to be equal to unity throughout, and `eta gt gt 1`.

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The correct Answer is:
`(mu_(0))/(pi)In(eta)`
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