A solenoid of 4 cm dia and 2 m long is closely wound with a single layer of 10 gauge (0.10 in dia) copper wire. The inductance per unit length at the centre is

(a)  2.52 µH
(b)  0.253 mH/m
(c)  2.5 H/m
(d)  2.02 H

Ans: B

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