Question

Two coaxial solenoids are made by winding thin cu wire over a pipe of cross sectional area a=10 cm^2 and length 20 cm. If one of the solenoids has 300 turns and the other 400 turns their mutual inductance is

Answer 1

$we \: know$

M=,u°N1 N2 A/ L

,u°=4π×10^-7

then,

N1=300 truns

N2=400 truns, A=10cm²,& l = 20cm

M= 0.15H