# plot overdamped response of the voltage across the capacitor.

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Sasheel Maharaj on 12 Mar 2020
Answered: Divya Yerraguntla on 16 Mar 2020
Over-damped response: Vi = 0 V, Vf = 10 V, R = 250 Ω, L = 10 mH, and C = 1 μF.
this is the equation for the voltage across the capacitor, but when i plot it on matlab i get straight lines and not a curve.
vC (t) = − 13.33Vexp(−t/0.2 ms) + 3.33Vexp(−t/50 μs) + 10V

Jakob B. Nielsen on 12 Mar 2020
Can you paste the code you have so far?
Sasheel Maharaj on 12 Mar 2020
t=[0:0.25:1.50]; y=-13.33*exp(-t/0.0002)+3.33*exp(-t/0.00005)+10
Plot(t,y)

Divya Yerraguntla on 16 Mar 2020
Hi Sasheel,
The voltage across the capacitor is getting saturated at approximately 1ms itself but your code is plotting the data until 1.5 seconds. So, try rescaling 't' to milliseconds instead of seconds to observe the exponential response. Try running the below code:
t= 0:0.000005:0.002;
y = -13.33*exp(-t/0.0002)+3.33*exp(-t/0.00005)+10;
plot(t,y);
Hope it helps!