Two long parallel wires whose centres are a distance 'd' apart carry equal currents in opposite directions.If the flux within wires is neglected, the inductance of such a wire of length 'l' and radius 'a' will be
a. L= [(
0I )/
] loge(d-a)/d b. L= [(
0I )/
] loged/a




c. L= [(
0I )/
] loge a/d d. L= [(
0)/
] Id/a



