U=10;
R=10;
L1=10;
L2=200;
L3=500;

%L1
tau1=R/L1;
t1=[0:0.1*tau1:10*tau1];
i1=(U/R)*(1-exp(-tau1*t1))
uL1=U*exp(-tau1*t1);

%L2
tau2=R/L2;
t2=[0:0.2*tau2:200*tau2];
i2=(U/R)*(1-exp(-tau2*t2))
uL2=U*exp(-tau2*t2);

%L3
tau3=R/L3;
t3=[0:0.2*tau3:500*tau3];
i3=(U/R)*(1-exp(-tau3*t3))
uL3=U*exp(-tau3*t3);

plot(t1,uL1,'b-',t2,uL2,'r-',t3,uL3,'g-');
xlabel('t(s)');
ylabel('uL');
legend('L1','L2','L3');
title('Napięcie na cewce');