A solenoid having 500 turns and length 2 m has radius of 2 cm, then self inductance of solenoid is :
4 x 10-4 H
2 x 10-4 H
8 x 10-4 H
16 x 10-4 H
Self inductance of solenoid is :
L=μ0n2Sl S=πr2 L=4π x 10-7 x N2l2πr2 x l n=Nl =4π2 x 10-7 x 252 x 104 x 4 x 10-4 L=2 x 10-4 H