Consider a long solenoid of length l and radius r . If n is the number of turns per unit length and 0 is the permeability of free space, the inductance of the solenoid is:

1. A. 0 r 2 n 2 l
2. B. 0 n 2 r 2 l
3. C. ( 0 2 )n 2 r 2 l
4. D. 2 0 n 2 r 2 l

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