M=FL;
M1=0.12*50*10=60;
M2=0,6*F;
M1=M2;
0.6F=60;
F=100 Н.
Uo=I1*(R1+R2+Ra)=1.4*90=126 B
I2=Uo/(R1+R2)=126/70=1.8 A