v=12;
r=500;
l=200*10^(-3);
disp("Part a");
t1=0.1*10^(-3);
t0=l/r;
i=v*exp(-t1/t0)/r;
disp("the current (in mA) 0.1 ms after the switch has been moved to position B is"); disp(i*10^3);
disp("Part b");
t2=20*10^(-6);
v1=v*exp(-t2/t0);
disp("the voltage (in V) across the inductor 20 μs after the switch has arrived at position B is"); disp(v1);
disp("Part c");
t3=0.2*10^(-3);
i1=v*exp(-t3/t0)/r;
disp("the circuit current (in mA) is"); disp(i1*10^3);
v2=-v*exp(-t3/t0);
disp("the inductor voltage (in V) is"); disp(v2);