A long straight wire of cross sectional radius a carries a current I. The return current is carried by an identical wire which is parallel to the first wire. The centre to centre distance between the two wires is d. Find the inductance (L) of a length x of this arrangement. Neglect magnetic flux inside the wires.

A long straight wire of cross sectional radius a carries a current I.

1.	A long straight wire of cross sectional radius a carries a current I. The return current is carried by an identical wire which is parallel to the first wire. The centre to centre distance between the two wires is d. Find the inductance (L) of a length x of this arrangement. Neglect magnetic flux inside the wires.
Answer» Correct Answer - `L = (mu_(0)x)/(pi) ln ((d-a)/(a))`

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