Question

The capacitor voltage due to a current of i=t^4with v(0^+)=3 is found from using _________

(a) ODE solver

(b) int() command

(c) quad() command

(d) diff() command

This question was addressed to me at a job interview.

The origin of the question is Integration in section Beyond the Basics of MATLAB

Answer 1

The correct answer is (a) ODE solver

For explanation: The case for the capacitor has an initial condition. So the int() command won’t merely give the voltage, as a function of time, for the capacitor. We need to use the ode45 solver or the ode23 solver. The quad command won’t also give the true solution for a voltage since it doesn’t return the complementary function.