An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm2. Its self inductance is
0.1256 mH
12.56 mH
1.256 mH
125.6 mH
L=μ0N2Al=4π×10−7×(1000)2×10×10−41=1.256 mH