U - 220B
V - 50 Гц
I - 0,2А
R - 100 Ом
L - ?
z = √(R^2 + W^2 +L2)=U/I = 220/0,2=1100 Ом
R^2+W^2*L^2 = 100^2 + W^2*L^2 = 1100^2
W^2 * L^2 = 1100^2-100^2=1200000 Oм^2
W = 2πf
w^2=4π^2*f = 10000π^2
L^2=R^2/w^2=1200000/10000π^2= 12,16Гн^2
L = √12,16=3,49 Гн