Find the inductance of a unit length of two parallel wires, each of radius a, whose centers are a distance d apart and carry equal currents in opposite direction. Neglect the flux within the wire.

Two long straight cylindrical wires each of radius a are placed at a seperation d. Both the wires carry equal and opposite current of magnitude I. F ind the induced (L) per unit length of this arrangement. Neglect magnetic flux inside the wires.

Two infinetly long straight parallel wires carry equal currents i in the same direction and are 2 m apart. Magnetic induction at a point which is at same normal distance root 2 m from each wire has magnitude

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Two long parallel wires carry currents of equal magnitude but in opposite directions. These wires are suspended from rod PQ by four chords of same length L as shown in figure . The mass per unit length of the wires