An air core solenoid has 1000 turns and is one metre long. Its cross sectional area is 10 cm2 It's self- inductance is
2.56 mH
1.92 mH
1.26 mH
2.78 mH
ϕ= NAB = NAμ0Nilϕ =LiL= N2Aμ0l=106x 10-3 x4πx 10-7 1=4π×10-4=12.56×10-4 H