tt1

clc
clear all
Lp=4.3e-3; 
Ra=13.51;   
f=logspace(1,5,200);  
w=2*pi*f;
num=[1];
den=[Lp/Ra 1];
[mag,pha]=bode(num,den,w);
figure(1);
loglog(f,mag,'-r','LineWidth',1);
xlabel('f/Hz');
ylabel('Magnitude');
axis([10^1 10^5 10^-3 10^0.5])
grid on