The inductance of a solenoid, 0.5 m long of cross-sectional area 20 cm2 and with 500 turns, is
12.5 mH
1.25 mH
15.0 mH
0.12 rnH
L=μ0N2Al
=4π×10-7×(500)2×20×10-40.5=1.25mH