disp("Part a");
l=100;
d=2*10^(-3);
ro=1.72*10^(-8);
a=%pi*(d^2)/4;
r=ro*l/a;
disp("the resistance (in Ω) of copper wire is"); disp(r);
disp("Part b");
ro1=2.63*10^(-8);
r1=r*ro1/ro;
disp("the resistance (in Ω) of aluminium wire is"); disp(r1);